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All over the world, Kostia (Костя , Kostia ) is a common male forename. The first name Kostia is habitual in Eastern Europe, particularly Moldova, where it is quite a common masculine name, Belarus, and Russia, where it is quite a rare masculine name. Also, Kostia is the last name as well as the forename.
Kostia is also a name for the fictitious and mythical characters: Konstantin Gavrilovich Treplyov , the character in the play "The Seagull" and Konstantin Dmitrievich Levin , the character in Anna Karenina.