Cognomen Osian (Osian 
, Осян 
) , across the world, is a rare family name. The family name Osian is characteristic of Aland Islands, where it is quite a common surname, Philippines, where it is a rare surname, and Belarus. Not in comparison with a country's population, it is commonest in Philippines, Nigeria, and Russia. Also, Osian is the forename as well as the last name.