Last name Isia (Isia 
, Ися 
) , in the world, is quite a rare cognomen. The cognomen Isia is habitual in Nigeria, where it is a rare surname, the Democratic Republic of the Congo, and Peru, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Nigeria, the Democratic Republic of the Congo, and Indonesia. Also, Isia is the forename as well as the last name.