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In all the world, Kastor (Kastor , Кастор) is a rare principally male, but scarcely girly given name. The forename Kastor is habitual in Cyprus, where it is quite a rare masculine name, Tanzania, where it is a rare masculine name, and Greece. Measured by absolute frequency, this name is the most popular in Tanzania, Pakistan, and Germany. Likewise, Kastor is the last name as well as the forename.
Kastor is also a name for the fictitious and mythical characters: Castor , the Greek mythical figure, brother of Pollux; Castor , the The Hunger Games character, The Hunger Games: Mockingjay – Part 2 and Castor Troy , character in Face/Off.