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Last name Troian (Троян
, Troian
, Троиан
) , in all the world, is a common surname. The cognomen Troian is characteristic of Eastern Europe, particularly Ukraine, where it is quite a common surname, Belarus, where it is quite a rare surname, and Moldova. Measured by absolute frequency, it most frequently occurs in Ukraine, Russia, and Brazil. Much less frequently, Troian is the forename as well as the last name.