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Worldwide, Petrina (Petrina , Петрина ) is quite a common girly given name. The first name Petrina is characteristic of Namibia, where it is quite a common female name, Iceland, where it is quite a rare unisex name, and Greece, where it is quite a rare feminine name. In absolute terms, it most frequently occurs in Brazil, the United States, and Namibia. Likewise, Petrina is the last name as well as the forename.