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Last name Guina (Гина , Guina , Гуина ) , around the world, is a common family name. The last name Guina is habitual in Bulgaria, where it is a common surname, Croatia, where it is quite a rare surname, and the Central African Republic. Not in comparison with a country's population, this name is the most popular in Bulgaria, Philippines, and the Democratic Republic of the Congo. Likewise, Guina is the forename as well as the last name.