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Last name Kulaga (Kulaga , Кулага , Петражицкий ) , around the globe, is quite a common family name. The cognomen Kulaga is habitual in Belarus, where it is quite a common surname, Ukraine, where it is quite a rare surname, and Latvia. Measured by absolute frequency, the name is most common in Eastern Europe, particularly Ukraine, Russia, and Belarus. Also, Kulaga is the forename as well as the last name.