Family name Adoniou (Adoniou 
) , around the world, is a very rare last name. The cognomen Adoniou is characteristic of Greece, where it is a rare surname, Australia, where it is a very rare surname, and Canada, where it is an extremely rare surname. Measured by absolute frequency, it is the most numerous in Greece, the United States, and Australia. Much less frequently, Adoniou is the forename as well as the last name.