Cognomen Bel-Osan (Bel-Osan 
) , globally, is a very rare family name. The surname Bel-Osan is habitual in South-eastern Asia, particularly Philippines, where it is a very rare surname. Parts of the name also exists independently as a last name Bel, and a last name Osan.
| VARIANT | COUNTRY |
|---|---|
| Bel-Osan | Philippines |