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Surname Costar (Kosto , Costar , Custo ) , all over the world, is quite a common last name. The last name Costar is characteristic of Southern Europe, particularly Malta, where it is quite a common surname, Bosnia and Herzegovina, where it is quite a rare surname, and North Macedonia. Measured by absolute frequency, the name is most common in Bangladesh, Saudi Arabia, and Bosnia and Herzegovina. Likewise, Costar is the forename as well as the last name.