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In all the world, Щастливий (Щастливий ) is an extremely rare unknown gender first name. Much more prevalently, Щастливий is the last name as well as the forename.
Schastliviy, and Schastlivy
Ігор, Артем, Євген, Микола, Андрій, Едуард, Сергій, Леонард, and Валентин