Cognomen Iosu (Iosu 
, Йосу 
) , all around the world, is a rare last name. The family name Iosu is characteristic of Spain, where it is quite a rare surname, Romania, and Israel, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Spain, Romania, and Russia. Also, Iosu is the forename as well as the last name.