Family name Sainia (Sainia 
) , in all the world, is a very rare surname. The family name Sainia is habitual in Finland, where it is a rare surname, Honduras, where it is a very rare surname, and Canada, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in India, Finland, and Honduras. More frequently, Sainia is the forename as well as the last name.