Around the world, Kostych (Kostych , Костич ) is an extremely rare unknown gender first name. Much more frequently, Kostych is the last name as well as the forename.
Костых, Костыч, and Костыш
Roman, and Ostap
, Костич 
) is an extremely rare unknown gender first name. Much more frequently, Kostych is the last name as well as the forename.