Seiichi
Meaningoften sincere first son · Japanese
Seiichi is a Japanese boy name often meaning “sincere first son”. In Japan, parents often choose a name as much for the kanji characters behind it as for its sound, so the same name can carry several shades of meaning. A meaning like this gives a child something to grow into, and a good story to tell when someone asks about their name. It sounds flowing and melodic, it's simple to spell and say, and it pairs well with a short middle name.
Did you know?
- Scrabble scoreIf names were allowed in Scrabble, Seiichi would score 12 points, thanks largely to the H (worth 4).
- GenerationSeiichi peaked in 1919, which makes it a Greatest Generation name, think great-grandparents.
- HistorySeiichi first shows up in US birth records in 1919, the first year at least 5 babies got it. It has been in use for 106 years since.
US births per million boys, 1919–2025
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Popularity: U.S. Social Security Administration (babies with 5+ births per year).
About the name Seiichi
Seiichi is a boy name of Japanese origin meaning “often sincere first son”. With 3 syllables it has a flowing, lyrical sound, so a short middle name balances it nicely. It was most fashionable in the 1910s, which gives it a vintage, grandparent-chic charm. It's rarely heard today, so it stands out while still being a real, established name.
Origin:Japanese names
More Japanese boy names
- Unisex name: Asa · healer
- Unisex name: Rio · river
- Unisex name: Akari · light, brightness
- Boy name: Kenzo · often healthy third son
- Boy name: Kenji · often strong second son
- Unisex name: Ren · often lotus
- Unisex name: Zen · meditation
- Unisex name: Mars · god of war
Questions about the name Seiichi
What does the name Seiichi mean?
Seiichi means “often sincere first son” and comes from Japanese. Other boy names with a similar meaning include Sincere (“sincere”), Seiji (“often sincere second son”), Atsuhiro (“often sincere and broad”) and Atsuo (“often sincere man”).
What is the origin of the name Seiichi?
Seiichi is Japanese in origin. Other Japanese names to consider are Asa (“healer”), Rio (“river”), Akari (“light, brightness”) and Kenzo (“often healthy third son”).
Is Seiichi a boy or girl name?
Seiichi is a boy name.
How popular is the name Seiichi?
Seiichi is rare: fewer than 5 US boys got it in 2025, and it was last given to 5 or more in 1926. It peaked at #3,115 in 1919, so it's a name with history that few kids share today.
What names are similar to Seiichi?
If you like Seiichi, you might also like Sincere, Seiji, Atsuhiro and Atsuo.
What should I know before naming my baby Seiichi?
Seiichi is a Japanese boy name often meaning “sincere first son”. In Japan, parents often choose a name as much for the kanji characters behind it as for its sound, so the same name can carry several shades of meaning. A meaning like this gives a child something to grow into, and a good story to tell when someone asks about their name. It sounds flowing and melodic, it's simple to spell and say, and it pairs well with a short middle name. Say it out loud with your last name and any middle names you're considering, and check the initials it makes.