Cognomen Bito-Onan (Bito-Onan 
) , in the world, is a very rare surname. The last name Bito-Onan is characteristic of South-eastern Asia, particularly Philippines, where it is a very rare surname. Parts of the name also exists independently as a first name Bito, and a last name Onan.
| VARIANT | COUNTRY |
|---|---|
| Bito-Onan | Philippines |