Cognomen Кирьяку (Kiriakou 
, Кирьяку 
) , in the entire world, is a rare last name. The surname Кирьяку is characteristic of Cyprus, where it is quite a common surname, Greece, where it is quite a rare surname, and Canada, where it is a rare surname. Measured by absolute frequency, it is commonest in Cyprus, Greece, and the United States.