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Surname Петрей (Petrei , Петрей , Petrej ) , all around the world, is a rare cognomen. The family name Петрей is habitual in Slovenia, where it is quite a rare surname, Switzerland, where it is a rare surname, and Denmark. In absolute terms, this name is the most popular in Italy, Slovenia, and Switzerland. Much less frequently, Петрей is the forename as well as the last name.