Cognomen Onia (Onia 
, Оня 
, Ònia 
) , all around the world, is quite a rare family name. The last name Onia is characteristic of Philippines, where it is quite a rare surname, the Democratic Republic of the Congo, and Qatar, where it is a rare surname. Measured by absolute frequency, it is commonest in Philippines, the Democratic Republic of the Congo, and Indonesia. Much less frequently, Onia is the forename as well as the last name.