Cognomen Ylieff (Ylieff 
) , in all the world, is a rare family name. The cognomen Ylieff is characteristic of Belgium, where it is a rare surname, Argentina, where it is a very rare surname, and Peru, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ylieff | Peru, Belgium, Chile, Argentina |
| yvan ylieff Belgian politician, BE (b. 1941) |
|