Surname In-Seok (인석 
, In-Seok 
) , worldwide, is an extremely rare last name. Predominantly, In-Seok is the forename as well as the last name. Parts of the name also exists independently as a last name In, and a last name Seok.
| VARIANT | COUNTRY |
|---|---|
| 인석 | South Korea |
| In-Seok | United States |