Surname Онси (Onsi 
, Онси 
) , across the world, is quite a rare cognomen. The surname Онси is characteristic of Lebanon, where it is quite a rare surname, Egypt, and United Arab Emirates, where it is a rare surname. Very seldom, Онси is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Onsi | United Arab Emirates, Lebanon, Indonesia, Egypt, Tunisia |
| Онси | Russia |