Seiichi
A boy's name of Japanese origin with 40 recorded U.S. births.
Meaning & Origin
Seiichi is a vintage name that peaked in early twentieth-century America and has since faded from common use. For parents drawn to retro charm, that quiet history is part of the appeal.
The open, approachable quality of its ending — ending on a vowel softens the overall impression — keeps the name compact and easy to pair with longer middle names or surnames.
Seiichi is not in the current top 1,000 boy names nationally, making it an uncommon choice — though your state or community may differ.
Seiichi is a boy's baby name of Japanese origin. The name can be written with various kanji combinations — common forms include 誠一 (sincerity + one/first), 清一 (pure + one/first), or 精一 (essence + one/first). The -ichi element, meaning 'one' or 'first,' is frequently used for eldest sons in Japanese naming tradition.
Seiichi was particularly common in Japan in the early-to-mid 20th century, and in the United States it appears among Japanese-American families carrying forward their cultural naming heritage.
EtymologyShow more
Though Seiichi dates back to 1919 in U.S. records, its etymological path is not always straightforward. Names that predate modern naming databases sometimes resist easy classification — they may have been oral traditions, regional family names, or adaptations that were never systematically recorded. The Japanese classification provides a starting point, but the full derivation likely involves more nuance than a single label can capture.
With only 40 recorded births, Seiichi has not been widely studied in naming literature — its story belongs primarily to the families who chose it.
At a Glance
Popularity Over Time
Seiichi has 6+ years of history in the U.S., first appearing in 1919.
Popularity by Decade
| Decade | Births | Avg Rank | Trend |
|---|---|---|---|
| 1920s | 32 | #4064 | ▲ |
| 1910s | 8 | #3342 | — |
The Story of Seiichi
A Greatest Generation name
Peaking in 1919, Seiichi is a name steeped in history. Boys named Seiichi are most likely born between 1919 and 1926.
How rare is Seiichi?
With fewer than 500 recorded births, Seiichi is an exceptionally rare name — a one-of-a-kind choice.
The journey through the decades
First appeared in the records in 1919, peaked in the 1920s with 32 births that decade.
Year-by-Year Data
View complete yearly data(6 years, 1919–1926)
| Year | Births | Rank |
|---|---|---|
| 1926 | 6 | #4116 |
| 1925 | 7 | #3687 |
| 1924 | 6 | #4271 |
| 1923 | 5 | #4791 |
| 1920 | 8 | #3454 |
| 1919 | 8 | #3342 |
Source: U.S. Social Security Administration. Showing years with 5+ recorded births.
Frequently Asked Questions
Is Seiichi a boy's or girl's name?
When was Seiichi most popular?
How popular is the name Seiichi?
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Data source: U.S. Social Security Administration, 1919–1926