A four-year-old was asked to imagine a name for a soon-to-be-born sibling.
If the baby were a girl, the child suggested a perfectly ordinary, cute human name.
And if the baby were a boy?
“Choo-Choo Locomotive Man.”
The proposal left the category of “human name” and entered Saturday-morning hero territory without warning.
Another young child once confessed, “I wish I had a different name.” The parent braced for a serious complaint about the child’s actual name and carefully asked what the preferred name would be.
“Dragon Buster.”
A different child repeatedly submitted “Kumataro” as the correct name for a younger brother.
At this point, asking preschoolers to name people is like inviting a monster designer into a product-planning meeting.
Creative output: unlimited.
Production privileges: absolutely not.
The scene also makes one legal rule feel strangely intuitive: Japanese law does not treat minors’ important contracts exactly like adults’ contracts. That law has nothing to do with baby naming, but the underlying distinction is useful.
Being able to generate a delightful idea is not the same thing as being ready to carry its long-term consequences alone.
1. A preschool naming algorithm often rewards what feels coolest right now
Adults automatically project a name through many future scenes:
a kindergarten badge,
a school roll call,
a hospital waiting room,
a job interview,
a business card,
a wedding,
a government counter,
and the same person at sixty.
A young child’s evaluation is more heavily weighted toward the present:
“It sounds cool.”
“It sounds strong.”
“I like it.”
Under those criteria, “Dragon Buster” is almost rational.
It defeats dragons.
Its combat rating is obviously higher than that of an ordinary given name.
The problem is that a legal name is not a game item. It is a social and administrative identifier the person may use for decades.
Imagine the fictional full name “Yamada Dragon Buster.”
Teacher: “Yamada Dragon Buster?”
Hospital: “Mr. Yamada Dragon Buster?”
Interviewer: “You’re Yamada Dragon Buster, correct?”
Retirement-age paperwork: “Dear Mr. Yamada Dragon Buster.”
The more ordinary the surname, the harder the second half hits.
Then imagine the same person at age 60.
2. Preschoolers can think about the future, but long-range simulation is still developing
It would be wrong to say young children simply do not think ahead.
Developmental research shows that children around three and four can talk about future events and, in experimental tasks, can sometimes choose objects that will be useful later. At the same time, the ability to construct a specific future situation mentally and use that simulation to guide present decisions develops substantially across early childhood.[1][2]
So the accurate statement is:
A four-year-old has a future. The resolution and distance of that future are not adult-like.
A child can imagine “my brother will be born soon” without being expected to simulate “my brother introducing himself to a client at age thirty-eight.”
“Dragon Buster” is therefore not a preschooler’s moral or intellectual failure.
It is a reminder that adults are supposed to provide the long-horizon forecasting department.
Asking a four-year-old to simulate “their sibling introducing themselves to a client at age 38” is a very different burden.
3. This is where Article 5 of Japan’s Civil Code suddenly feels relatable
Article 5 of Japan’s Civil Code generally requires a minor to obtain the consent of a legal representative before conducting a legal act. An act carried out without required consent can generally be rescinded, subject to statutory exceptions such as acts that merely grant rights or release obligations.[3]
Since April 1, 2022, Japan’s age of majority has been eighteen.[4]
But the important legal boundary is this:
The minor’s right of rescission is not a baby-naming rule.
A four-year-old saying, “I approve Choo-Choo Locomotive Man” does not trigger Civil Code rescission.
The child simply does not hold final legal authority over the sibling’s name.
In practical terms:
Child: “Approved: Choo-Choo Locomotive Man.”
Family: “Proposal received.”
System: “You are not the final approver.”
Why does Article 5 still come to mind? Because both situations make the same institutional intuition visible: developing judgment and full unilateral responsibility for high-impact, long-lasting acts are not identical things.
This is not an argument against children’s imagination.
It is an argument about decision rights.
Since April 1, 2022, the age of majority is 18, so people under 18 are generally minors for this rule.[4]
4. Viral lists of “real crazy names” are a verification trap
Search the internet for unusual Japanese names and you quickly enter folklore territory.
Lists circulate with shocking combinations of kanji and readings, but many cannot be traced to a verified individual, an official record, serious reporting, or a court file. Their provenance may be nothing more than “I saw it years ago on a message board.”
This article therefore does not repeat weakly verified unusual names as the identities of real people.
Inventing a stranger’s legal name for a joke would be especially perverse in an article about names.
A well-documented public legal episode is the 1993 case in Akishima, Tokyo involving a birth notification that proposed the name meaning “Devil.” Japanese government materials recount the filing, the municipal and Justice Ministry review, and the family-court dispute.[5]
The important lesson is not simply that the name was unusual.
The episode publicly raised a harder question:
What happens when parental naming authority collides with a child’s welfare and future social life?
5. Since 2025, name readings themselves have entered the family register
On May 26, 2025, a revised Family Register Act took effect, adding the phonetic reading of names to Japan’s family register.[6]
The reading must now be one that is generally recognized as a reading of the characters used in the name.[6]
The Ministry of Justice gives clear examples of readings that would generally not qualify:
- reading 太郎 as “George” or “Michael,”
- adding an unrelated extra word to the reading of 健,
- reading 高 with the opposite meaning,
- reading 太郎 as “Jiro,” creating confusion with a different name.
The ministry also notes that discriminatory, obscene, antisocial, or otherwise socially unacceptable readings may be rejected.[6]
So the old fantasy of writing an ordinary set of kanji and assigning it an entirely unrelated super-hero reading has become much harder.
A name like:
“太郎 — reading: Dragon Buster”
now faces an obvious problem.
The register can effectively ask: “Where, exactly, did that reading come from?”
6. What if you write “Dragon Buster” directly in katakana?
This is the interesting part.
Japanese given names are not limited to kanji. Hiragana and katakana are permitted name characters under the relevant family-register rules.[7][8]
Ministry of Justice materials also explain that the long-vowel mark U+30FC may be used in a child’s name.[8]
So it would be inaccurate to say:
“Dragon Buster is automatically forbidden merely because it is written in katakana.”
But the opposite claim would also be inaccurate.
Katakana does not mean that every conceivable string is guaranteed acceptance.
Questions of abuse of naming authority, social acceptability, child welfare, and individual administrative review can still matter.[8][5]
Writing the sound directly in katakana may make the character-reading relationship simpler than forcing unrelated kanji to carry the reading.
It does not make the person’s next sixty years simpler.
7. Overriding everyone to file “Dragon Buster” would be a modern Run, Melos!
Imagine the obstacle course.
Relative: “Please don’t.”
Friend: “Sleep on it.”
Grandparent: “Use a normal name.”
Clerk: “Just to confirm, is this really what you intend?”
Parent, gripping the birth form: “I have decided. Dragon Buster.”
Then the parent runs toward the counter.
Measured only by persistence, it has the energy of a modern Run, Melos!
But there is one decisive difference.
The hero of that story largely bears the cost of his own conviction.
With a child’s legal name, the long-term cost is mostly paid by another person: the child.
So “I stood firm despite everyone’s opposition” is not automatically admirable.
Persistence must be evaluated alongside:
Whose rights are being exercised, and who pays if the decision is wrong?
Before fighting dragons, defeat the externality.
8. “The parent is still in elementary school” is funny, but there is a more precise diagnosis of the decision
When people see an extremely eccentric name, the joke writes itself:
“Did the parent’s taste stop developing at age ten?”
As comedy, fair enough.
As analysis, the pattern is more specific. Trouble becomes more likely when several tendencies combine:
- current cuteness, humor, or coolness gets very high weight;
- being unique is treated as intrinsically valuable;
- the name is treated as the parent’s artwork rather than the child’s public identifier;
- the name is not tested across ten, thirty, or sixty years of use;
- criticism is interpreted only as pressure from boring traditionalists;
- future name-changing costs are assumed to be trivial.
Rather than calling the entire adult mind childish, the more accurate description is:
The decision heavily discounts future costs that will be paid by someone else.
A preschooler shouting “Dragon Buster!” is age-appropriate.
An adult shipping it straight into the family register is where quality assurance enters the story.
One predictable failure mode is not testing how the name will work 10, 30, and 60 years later.
9. “Short-Sleeper Junior, sleeps 8 hours 32 minutes” exposes the ownership problem
Consider another fictional name:
Short-Sleeper Junior.
Suppose a parent strongly believes in testing unconventional lifestyles despite social criticism and encodes that personal identity into the child’s name.
Then the child grows up and sleeps a comfortable eight hours and thirty-two minutes every night.
We now have:
Short-Sleeper Junior — nightly sleep: 8 h 32 min.
The name loses an argument every evening.
The joke is not really about sleep.
It is about the difference between:
experimenting on your own life, and permanently branding another person with your experiment.
You may choose unusual clothes.
You may choose an unusual career.
You may test an unconventional personal routine.
You mainly receive the consequences.
A child’s name is different: the parent chooses it, while the child must use it at school, hospitals, workplaces, banks, and government offices.
The decision-maker and the cost-bearer are not the same person.
That distinction matters.
10. “They can just change it later” is not a perfect undo button
In Japan, changing the given name itself generally requires permission from a family court and a “legitimate reason.”
Court guidance describes this as a situation in which keeping the existing name causes difficulty in social life. A simple preference or change of mood is not an unrestricted basis for changing one’s legal name.[9]
For a child under fifteen, the legal representative handles the application on the child’s behalf.[9]
So:
“They can just change it when they grow up”
does not reduce the original choice to zero cost.
Even if the legal name eventually changes, the following do not disappear retroactively:
- years of being called the old name,
- explanations at school and in relationships,
- document and account updates,
- links between old and new records,
- repeated questions about why the change happened.
The text in the register may be reversible. The person’s history is not fully reset.
That is a useful principle for any long-term decision imposed on someone else.
For a child under 15, the legal representative applies for permission to change the given name.[9]
11. Children’s naming creativity is excellent — just give it a safer deployment target
None of this means children should be excluded from naming games.
Quite the opposite.
“Choo-Choo Locomotive Man.”
“Dragon Buster.”
“Kumataro.”
Adults can spend three hours in a meeting and still fail to generate phrases with that much immediate force.
Keep the creativity.
Change the medium.
Use spectacular names for:
a game character,
a stuffed animal,
a robot,
a pet nickname,
a secret base,
a temporary family nickname,
a special move in a story.
Dragon Buster is an excellent screen name.
The problem is not imagination.
The problem is deploying a reversible joke into an identity another person may carry for decades.
Let creativity run wild where deletion is easy.
Use adult review where another human bears the long-term cost.
100 points as a concept; rejected for family-register deployment.
12. Conclusion: children can be the naming department; adults must be the release gate
A four-year-old wanting to be “Dragon Buster” feels extremely four-year-old in the best possible way.
Strong.
Cool.
Kills dragons.
The adoption case is crystal clear.
The adult response does not have to be:
“Never think of names like that.”
A better response is:
“As a concept: 10/10. For the family register: rejected.”
Before turning a joke into a legal name, a simple stress test helps:
- Say the full name aloud in a school, hospital, job interview, government office, and retirement-age setting.
- Ask whether the child can later reject the parent’s hobby, belief, or identity without having to reject their own name.
- Separate the benefit of “standing out” from the child’s recurring cost of explanation.
- Do not use “they can change it later” as permission to be careless now.
- Test explosive names first as nicknames, fictional names, or game names.
The minor’s right of rescission is not a naming law.
But after watching this entire naming tournament, one institutional intuition becomes unusually easy to understand:
“Yes, there are good reasons not to give a child unilateral authority over every high-impact decision.”
Let the child pitch.
Let the adult model the long term.
And preserve “Choo-Choo Locomotive Man” forever as the greatest rejected proposal in family history.
That may be the optimal outcome for everyone.
References (9)
- Cuevas K, Rajan V, Morasch KC. “Episodic Memory and Future Thinking During Early Childhood: Linking the Past and Future.” Developmental Psychobiology. 2015;57(5):552–565 pmc.ncbi.nlm.nih.gov
- Ayson G, Atance CM. “Children’s mental time travel into the future: a functional perspective.” Philosophical Transactions of the Royal Society B. 2024 pmc.ncbi.nlm.nih.gov
- Ministry of Justice, Japan. Civil Code Article 5 (educational material reproducing the statutory text on minors and consent/cancellation) moj.go.jp
- Ministry of Justice, Japan. “Civil Code (Age of Majority) Amendment Q&A.” The age of majority became 18 on 2022-04-01 moj.go.jp
- Agency for Cultural Affairs, Japan. Japanese Language Subcommittee minutes discussing the 1993 Akishima “Akuma” naming dispute and the conflict between naming authority and child welfare bunka.go.jp
- Ministry of Justice, Japan. “Frequently Asked Questions” on family-register furigana. The system began on 2025-05-26; readings must generally be recognized as readings of the name’s characters, with examples of unacceptable readings moj.go.jp
- Ministry of Justice, Japan. “Kanji that can be used in children’s names,” with family-register rules also recognizing hiragana and katakana as usable name characters moj.go.jp
- Ministry of Justice, Japan. Family-register study material explaining usable name characters, including hiragana, katakana and the long-vowel mark, and discussing general legal limits on name readings and naming authority moj.go.jp
- Courts in Japan. FAQ on permission to change a child’s given name: a legitimate reason is required; social-life hindrance is a core consideration; for children under 15, the legal representative applies courts.go.jp
