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In the entire world, Алексеий (Aleksey , Алексеий , Alexeii ) is quite a common predominantly masculine, but very seldom feminine first name. The given name Алексеий is characteristic of Aland Islands, where it is quite a common masculine name, Bulgaria, where it is quite a rare masculine name, and Uzbekistan, where it is quite a rare largely male, but uncommonly girly name. Not in comparison with a country's population, it is commonest in Russia, the United States, and Uzbekistan. Much less frequently, Алексеий is the last name as well as the forename.
Алексеий is also a name for the fictitious and mythical characters: Rhino , the fictional character in Marvel Comics, The Amazing Spider-Man 2; Alyosha , the character from Dostoyevsky's Humiliated and Insulted; Alyosha Kravinoff , the fictional character in Marvel Comics; Alexey Shvabrin , character in The Captain's Daughter and Alexei Karenin , the character in Anna Karenina, among other works.