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Globally, Gerasim (Герасим , Gerasim , גרסים ) is quite a rare male first name. The forename Gerasim is habitual in Bulgaria, where it is quite a common boy's name, Kazakhstan, where it is quite a rare masculine name, and Georgia. Measured by absolute frequency, the name is most common in Eastern Europe, particularly Russia, Bulgaria, and Ukraine. Also, Gerasim is the last name as well as the forename.
Gerasim is also a name for the fictitious and mythical characters: Gerasim , the protagonist of “Mumu”.