# Si (surname)

Source: https://namelineage.com/surname/si/  
Publisher: Name Lineage. Counts from the US Census Bureau; origin and etymology from Wiktionary; bearers from Wikidata. Data updated 2026-11-11.

A surname from Mandarin.

| Field | Value |
|---|---|
| Origin | Chinese |
| Type | not recorded |
| People in the US (2010 Census) | 1,166 |
| US rank (2010) | 22,158 of 162,253 |
| How often | about 1 in every 264,790 people |
| Change since 2000 | +76% (661 in 2000) |
| Pronunciation | /saɪ/, 1 syllable |
| Variant spellings | Sy, Su, Ssu, Szu |

## Etymology

From clipping of various words beginning with the syllable /saɪ/.

## Who carries it

Share of people named Si in the 2010 US Census by the Census's own race and ethnicity groups. The Census suppresses a share when the count behind it is small.

| Group | Share |
|---|---|
| White (not Hispanic) | 8.9% |
| Black (not Hispanic) | 3.0% |
| Hispanic or Latino (any race) | 2.1% |
| Asian and Pacific Islander | 85% |

## Where

Wikidata records people named Si in Xia dynasty.

## People named Si

- Fa of Xia, 16th Chinese king of Xia Dynasty
- Shaokang, 6th king of the Xia dynasty of ancient China

## Similar surnames

Siu, Saia, Sieh, Shih, Shieh, Shaw, Shah, Shea, Seay, Su, Shi, Shay.

## How to read these numbers

A Census count is people alive and counted in 2010, not births, and names occurring fewer than 100 times are not published at all. Ethnicity shares are the Census's own categories.