Surname Кириаку (Kyriakou 
, Kiriakou , Кириаку 
) , globally, is a common family name. The last name Кириаку is characteristic of Cyprus, where it is a widespread surname, Greece, where it is quite a common surname, and Bulgaria, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in Cyprus, Greece, and the United Kingdom. Much less frequently, Кириаку is the forename as well as the last name.