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In all the world, Mouraviov (Муравьёв , Mouraviov) is an extremely rare unknown gender forename. Much more frequently, Mouraviov is the last name as well as the forename.
Murav'Ev, Muraviev, Muravjov, Muravyov, Муравиов, Муравйов, Муравьйов, and Мураўёў