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In all the world, Чивилёв (Чивилёв ) is an extremely rare unknown gender first name. Much more frequently, Чивилёв is the last name as well as the forename.
Chivilev, Chivilyov, and Tchivilev
Юрий, Михаил, Сергей, Дмитрий, Владимир, and Александр