# Kosak (surname)

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

A surname.

| Field | Value |
|---|---|
| Origin | not recorded |
| Type | not recorded |
| People in the US (2010 Census) | 596 |
| US rank (2010) | 37,391 of 162,253 |
| How often | about 1 in every 518,029 people |
| Change since 2000 | 0.0% (596 in 2000) |
| Pronunciation | not recorded |
| Variant spellings | none recorded |

## Etymology

* As a Polish, Lower Sorbian (Kósak), Czech and Slovak surname, variant of Kós, surname meaning "blackbird," from Proto-Slavic *kosъ, and Kosa, meaning "scythe." The Sorbian forms are sometimes Germanized as Kossack or in some cases Kozak. * Also as a Czech surname, from košák (“beehive”), itself formed from koš (“basket”). * As a Slovene surname, from koščak (“kind of nut tree”), probably from kost (“bone”). Compare Koschak. * As a Serbo-Croatian surname, from košak (“basket”). Compare Kosack.

## Who carries it

Share of people named Kosak 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) | 94% |
| Black (not Hispanic) | 1.0% |
| Hispanic or Latino (any race) | 1.9% |
| Asian and Pacific Islander | 2.0% |
| American Indian and Alaska Native | 0.0% |
| Two or more races | 1.0% |

## Similar surnames

Kozak, Koski, Kosek, Kocsis, Kawasaki, Kujawski, Kochis.

## 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.