In the entire world, Kostash (Kostash , Косташ ) is an extremely rare male forename. Much more frequently, Kostash is the last name as well as the forename.
Koçtaş, and Костащ
Mr, Dmitriy, Rebecca, Charles, Adelina, Miranda, Viktor, Dmitro, Dmitri, Denise, Adrian, Yuriy, Illia, Irina, Elena, Tammy, Roman, Anton, Myrna, Eryn, Bill, Alex, Amy, Ms, Patricia, and Vladimir
, Косташ 
) is an extremely rare male forename. Much more frequently, Kostash is the last name as well as the forename.