In all the world, Djagilev (Дягилев , Djagilev ) is an extremely rare unknown gender forename. Much more frequently, Djagilev is the last name as well as the forename.
Diaghilev, Diagilev, and Дйагилев
Aleksandr
, Djagilev 
) is an extremely rare unknown gender forename. Much more frequently, Djagilev is the last name as well as the forename.