Cognomen Ủn Ỉn (Ủn Ỉn 
) , across the world, is a very rare surname. The family name Ủn Ỉn is habitual in South-eastern Asia, particularly Vietnam, where it is a very rare surname. Very seldom, Ủn Ỉn is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ủn Ỉn | Vietnam |