Kotaro
/K-OW-T-AA-R-OW/
Eldest son of light (or great/healthy eldest son) — Kotaro (Japanese 光太郎 or 康太郎 or 浩太郎) most commonly joins ko 光 (light, radiance), or ko 康 (health, peace), or ko 浩 (vastness) with taro 太郎 (eldest son, firstborn). The tiger reading ko 虎 exists but is rare; the dominant forms celebrate a radiant, vigorous firstborn son.
See Kotaro scored for your familyQuick — what every parent wants to know about Kotaro:
Yes — Kotaro is a Shinto boy name of Japanese origin, meaning “Eldest son of light (or great/healthy eldest son) — Kotaro (Japanese 光太郎 or 康太郎 or 浩太郎) most commonly joins ko 光 (light, radiance), or ko 康 (health, peace), or ko 浩 (vastness) with taro 太郎 (eldest son, firstborn). The tiger reading ko 虎 exists but is rare; the dominant forms celebrate a radiant, vigorous firstborn son.”. It also appears in Buddhist tradition.
How well does Kotaro fit your family?
This page tells you what Kotaro means. The app tells you whether it's right for your baby — scored against the names already in your family, your heritage, and your baby's exact birth star.
Unlock Kotaro's score — free
Six signals — scored for your family, not in the abstract:
Meaning & origin
Kotaro is a boy's name of Japanese origin, traditionally used in Shinto families. The name means "Eldest son of light (or great/healthy eldest son) — Kotaro (Japanese 光太郎 or 康太郎 or 浩太郎) most commonly joins ko 光 (light, radiance), or ko 康 (health, peace), or ko 浩 (vastness) with taro 太郎 (eldest son, firstborn). The tiger reading ko 虎 exists but is rare; the dominant forms celebrate a radiant, vigorous firstborn son." and belongs to the Courage cluster — names for children who will grow into bold, fearless hearts.
Beyond its Shinto heritage, Kotaro is also used in Buddhist traditions, reflecting how this name has traveled across cultures.
Common among Japanese families, Kotaro carries cultural weight that goes beyond its dictionary definition — it's a name with a story and a community.
What's Kotaro's birth star?
In Vedic tradition, a baby's name is matched to their nakshatra (birth star) and rashi (moon sign) — usually through its first syllable. Kotaro opens with “Ko.” But whether that's auspicious depends on your baby's exact date, time, and place of birth.
NameRoot works it out for you. Enter your baby's birth details and see exactly which nakshatra and rashi Kotaro aligns with — and how strongly it scores.
See Kotaro's birth-star reading →What does Kotaro's numerology say?
Numerology assigns each name a single-digit destiny number by summing its letter values. Different schools use different mappings — NameRoot computes both so you can see how Kotaro resonates in either tradition.
Kotaro's destiny number is 8 — but a number only matters in context. The app matches it to your family's own numbers for a real compatibility read. See Kotaro's full reading →
Does Kotaro go with your family's names?
Kotaro breaks into 6 sounds: /K-OW-T-AA-R-OW/. The real test isn't how it sounds alone — it's how it sounds beside the names already in your family: yours, your partner's, and any brothers or sisters. NameRoot scores that harmony, so Kotaro sits naturally next to a Mum and Dad like Michael & Anna, or a big sister named Gianna — no awkward clashes, no two names that blur together. Hear Kotaro beside your family's names →
Nicknames
Common affectionate forms of Kotaro — useful for everyday family conversation, early childhood, or as standalone given names themselves.
Names similar to Kotaro
If Kotaro resonates with you, these names live in the same world — drawn from the same tradition, sharing the same meaning, or echoing a similar sound.
From the same tradition
Other Shinto boy names, common in Japanese families
Sharing the same meaning
Other Shinto boy names from the Courage cluster
Names that sound similar
Shinto boy names that open with the same syllables as Kotaro
Explore more names
Keep exploring names like Kotaro — by tradition, by meaning, or by first letter.
Common questions about Kotaro
What does the name Kotaro mean?
Kotaro means "Eldest son of light (or great/healthy eldest son) — Kotaro (Japanese 光太郎 or 康太郎 or 浩太郎) most commonly joins ko 光 (light, radiance), or ko 康 (health, peace), or ko 浩 (vastness) with taro 太郎 (eldest son, firstborn). The tiger reading ko 虎 exists but is rare; the dominant forms celebrate a radiant, vigorous firstborn son.." It is a boy name of Japanese origin, traditionally used in Shinto families.
Is Kotaro a boy or girl name?
Kotaro is most commonly used as a boy name.
What is the origin of the name Kotaro?
Kotaro is of Japanese origin, used in Shinto, Buddhist traditions, commonly among Japanese families.
Is Kotaro a Shinto name?
Yes. Kotaro is a boy name traditionally used in Shinto families, of Japanese origin. It also appears in Buddhist tradition.
What does Kotaro mean in Japanese?
Kotaro originates from Japanese, where it means "Eldest son of light (or great/healthy eldest son) — Kotaro (Japanese 光太郎 or 康太郎 or 浩太郎) most commonly joins ko 光 (light, radiance), or ko 康 (health, peace), or ko 浩 (vastness) with taro 太郎 (eldest son, firstborn). The tiger reading ko 虎 exists but is rare; the dominant forms celebrate a radiant, vigorous firstborn son.."
What are common nicknames for Kotaro?
Common short forms of Kotaro include Kota, Koti.
What is the numerology of Kotaro?
Kotaro has a Pythagorean destiny number of 8 — material mastery and executive power.
See how Kotaro scores for your family
NameRoot is the only baby-name app that scores every name across 6 signals against your specific family context. Download free — Kotaro is waiting.
Get NameRoot — free