Cognomen Тройа (Troia 
, Тройа 
) , worldwide, is quite a rare surname. The cognomen Тройа is habitual in Italy, where it is quite a rare surname, Romania, and Portugal, where it is a rare surname. In absolute terms, it most frequently occurs in Italy, the United States, and Argentina. Much less frequently, Тройа is the forename as well as the last name.