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Cognomen Gregorios (Gregorios , Γρηγόριος , Григориос ) , across the world, is a rare last name. The cognomen Gregorios is characteristic of Oman, where it is a rare surname, Philippines, and the United Kingdom, where it is a very rare surname. In absolute terms, this name is the most popular in Philippines, the United States, and Oman. Also, Gregorios is the forename as well as the last name.