Globally, Koselev (Koselev , Коселев ) is an extremely rare unknown gender forename. Much more prevalently, Koselev is the last name as well as the forename.
Košelev
Mr, Maksim, Sergiy, Daniel, and Nikita
, Коселев 
) is an extremely rare unknown gender forename. Much more prevalently, Koselev is the last name as well as the forename.