Seiji

♂ Boy

Pronounced SAY-jee /ˈseɪ.dʒi/Medium

Meaning: From the Japanese — variously sei, 'lawful/correct/pure/star', + ji, 'two/order/rule', hence 'lawful; well-governed'; routes layered by characterLow

In 30 seconds: Lawful; well-governed: Seiji is Japanese. Crisp, classic, and warm (said 'SAY-jee'). Routes layered.

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Origin LowJapanese

MeaningFrom the Japanese — variously sei, 'lawful/correct/pure/star', + ji, 'two/order/rule', hence 'lawful; well-governed'; routes layered by character

U.S. rank (2025)#9569 ↗ Rising

2025 U.S. births8 boys (0.00% of U.S. boys)

Peak year2007

Total births (all-time)≈ 517

Popularity in the U.S. · SSA data

U.S. births per year (Social Security Administration, 1880–present). Pink marker = peak year.

SSA data updated May 2026. How we source & verify this data.

History & Origin

Seiji comes from the Japanese — variously sei, 'lawful/correct/pure/star', + ji, 'two/order/rule', hence 'lawful; well-governed' (routes layered by character, which we note). A crisp, classic name (borne by the conductor Seiji Ozawa; said 'SAY-jee').

In the U.S. it appears in Japanese families. Rare, lawful-and-well-governed at the root, and crisp.

Did you know? Seiji joins Japanese elements variously meaning 'lawful/pure/star' + 'two/order', hence 'lawful; well-governed' — a crisp, classic name (the routes are layered by character, which we note; said 'SAY-jee').

Overall data confidence 34%

References — Seiji — Japanese; character-dependent

Variations

SejiSeiji

Nicknames

Sei

Famous Bearers

Famous bearers coming soon.

If you like Seiji…

Kenji— a fellow -ji Japanese boys' name

Koji— a sound-adjacent -ji Japanese boys' name

Sanji— a fellow Japanese choice

Renji— a fellow Japanese choice

Joji— shares the -ji ending

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Frequently Asked

What does the name Seiji mean?

Seiji is Japanese, variously 'lawful; well-governed' (the exact sense varies by character). We note the layered routes.

How do you pronounce Seiji?

It's said SAY-jee /ˈseɪ.dʒi/ — two syllables, stress on the first.

Is Seiji a boy or girl name?

Seiji is a boy's name.

How popular is Seiji?

Seiji is a very rare name in the U.S.