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Last name Petrou (Петру , Petrou , بترو ) , in all the world, is a common cognomen. The family name Petrou is characteristic of Cyprus, where it is a widespread surname, Greece, where it is quite a common surname, and Australia, where it is quite a rare surname. In absolute terms, this name is the most popular in Greece, Cyprus, and the United Kingdom. Much less frequently, Petrou is the forename as well as the last name.