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Seiji
BoyMeaning of Seiji: Japanese: 'lawful' or 'second-born'
Seiji is a boy's name most strongly associated with Japanese naming. It has 5 letters and 2 syllables, and it is a genuinely rare and unique choice — 8863rd most popular boys' name in the United States in 2025.
US rank 2025
#8863
8 babies in 2025
England & Wales 2024
—
Fewer than 3 babies or unlisted
US babies since 1880
517
First recorded 1914 · peak 2007
Trend
stable
Style: rare
Popularity over time
Gender split
100% boys · 0% girls, based on US, UK and international usage.
Origins & cultures
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