All around the world, Kostyo (Kostyo 
) is an extremely rare unknown gender forename. Much more frequently, Kostyo is the last name as well as the forename.
Ann, Debra, David, Garry, Laura, Linda, Louis, Janet, James, Tammy, Nancy, Elsie, Emily, Eupha, Helen, Melody, Sandra, Sharon, Steven, Sylvia, Andrew, Amparo, Ronda, Brenda, Katie, Brook, Pat, Jim, Imi, Ian, Mary, Mike, Anna, Anne, Cris, Kara, Kris, Paul, Greg, Lisa, John, Joel, Sarah, Shawn, Susan, Steve, Carol, Karen, and Kailey