Siwoo
A boy's name of Korean origin with 21 recorded U.S. births.
Meaning & Origin
When Siwoo hit its peak of 6 births in 2015, social media, global pop culture, and a growing appetite for unique names were reshaping how American parents chose names.
Today, Siwoo reads as a name tied to a specific era — which is exactly what draws some parents to it.
Siwoo is not in the current top 1,000 boy names nationally, making it an uncommon choice — though your state or community may differ.
Siwoo is a Korean masculine name, written 시우 in Hangul, that combines characters associated with concepts like "time" or "beginning." Korean compound names are carefully chosen for their meaning and harmonic balance, and Siwoo has a clean, modern sound that has become popular in South Korea.
For Korean-American families, Siwoo bridges both cultures naturally — it's easy to pronounce in English while remaining unmistakably Korean in identity. The name carries a fresh, contemporary energy without sacrificing cultural roots.
EtymologyShow more
Siwoo is built from 5 letters and two syllables — a mid-length form that balances memorability with distinctiveness. Within the Korean naming tradition, this brevity is common among names that have been worn down through centuries of use, shedding syllables along the way.
The interplay of consonants and vowels in Siwoo creates its characteristic open, approachable quality. Two-syllable names are the most common length in American naming, hitting a natural speech rhythm that works across formal and informal contexts.
At a Glance
Popularity Over Time
Siwoo has 4+ years of history in the U.S., first appearing in 2008.
Popularity by Decade
| Decade | Births | Avg Rank | Trend |
|---|---|---|---|
| 2020s | 10 | #13960 | ▲ |
| 2010s | 6 | #11881 | ▲ |
| 2000s | 5 | #14315 | — |
The Story of Siwoo
A Gen Alpha name
Peaking in 2015, Siwoo is a fresh, modern favorite. Boys named Siwoo are most likely born between 2008 and 2023.
How rare is Siwoo?
With fewer than 500 recorded births, Siwoo is an exceptionally rare name — a one-of-a-kind choice.
The journey through the decades
First appeared in the records in 2008, peaked in the 2020s with 10 births that decade.
Year-by-Year Data
View complete yearly data(4 years, 2008–2023)
| Year | Births | Rank |
|---|---|---|
| 2023 | 5 | #13883 |
| 2022 | 5 | #14036 |
| 2015 | 6 | #11881 |
| 2008 | 5 | #14315 |
Source: U.S. Social Security Administration. Showing years with 5+ recorded births.
Frequently Asked Questions
Is Siwoo a boy's or girl's name?
When was Siwoo most popular?
How popular is the name Siwoo?
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Data source: U.S. Social Security Administration, 2008–2023