Cognomen Omaca-An (Omaca-An 
) , worldwide, is a very rare family name. The surname Omaca-An is habitual in South-eastern Asia, particularly Philippines, where it is a very rare surname. Very seldom, Omaca-An is the forename as well as the last name. Parts of the name also exists independently as a last name Omaca, and a last name An.
| VARIANT | COUNTRY |
|---|---|
| Omaca-An | Philippines |