Surname Woo-Il (우일 
, Woo-Il 
) , in the world, is an extremely rare last name. Much more prevalently, Woo-Il is the forename as well as the last name. Parts of the name also exists independently as a last name Woo, and a last name Il.
| VARIANT | COUNTRY |
|---|---|
| 우일 | South Korea |
| Woo-Il | United States |