Si
- US rank
- Unranked
- Syllables
- 1
- Peak
- #2,742 in 1934
0 babies were named Si in the US in 2025.
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US births per million boys, 1927–2025
Similar names
Popularity: U.S. Social Security Administration (babies with 5+ births per year).
Did you know?
A few things about Si you might not know, from US birth records. Handy for convincing a partner, or a grandparent.
- HistorySi first shows up in US birth records in 1927, the first year at least 5 babies got it. It has been in use for 98 years since.
- Best yearIts best year was 1934, when it reached #2,742.
About the name Si
Si is a boy name of Hebrew and Latin origin. It has 2 letters and 1 syllable, starting with S and ending in “-si”. US birth records list Si for boys from 1927 to 2017, in 24 of those 91 years. Its best year was 1934, when it ranked #2,742 among boy names. It hasn't been given to 5 or more US babies in a year since 2017, so today it's a genuinely rare choice.
Origin:Hebrew namesLatin names
| Decade | Babies per million | About 1 in |
|---|---|---|
| 1920s | 1.5 | 681,818 boys |
| 1930s | 0.8 | 1,298,701 boys |
| 1940s | 0.4 | 2,777,778 boys |
| 1950s | 0.3 | 3,571,429 boys |
| 1970s | 0.9 | 1,149,425 boys |
| 1980s | 2.1 | 485,437 boys |
| 1990s | 1.0 | 961,538 boys |
| 2000s | 1.6 | 625,000 boys |
| 2010s | 2.6 | 390,244 boys |
Other spellings of Si
More Hebrew boy names
- Unisex name: Noah · rest, comfort
- Unisex name: James · supplanter
- Boy name: Elijah · my God is Yahweh
- Boy name: Mateo · gift of God
- Boy name: Benjamin · son of the right hand
- Boy name: Levi · joined, attached
- Unisex name: Elias · my God is Yahweh
- Boy name: Jack · God is gracious
Questions about the name Si
What is the origin of the name Si?
Si has Hebrew, Latin roots in our records. Other Hebrew names include Noah, James, Elijah.
Is Si a boy or girl name?
Si is a boy name.
How popular is the name Si?
Si is rare: fewer than 5 US boys got it in 2025, and it was last given to 5 or more in 2017. It peaked at #2,742 in 1934.