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Globally, Щегльов (Щегльов ) is an extremely rare unknown gender forename. Much more frequently, Щегльов is the last name as well as the forename.
Chtcheglov, Sceglov, Scheglov, Shcheglov, Shchehlov, and Sheglov
Іван, Юрій, Леонід, Сергій, Геннадій, and Володимир