Throughout the world, Kostelyk (Kostelyk 
) is an extremely rare unknown gender forename. Much more frequently, Kostelyk is the last name as well as the forename.
Ed, Katie, Paige, Renee, David, Donna, Jacob, James, Jamie, Jared, Kathy, Jason, Jesse, Nelly, Sheryl, Sidney, Angela, Calvin, Philip, Dorian, Louise, Jonah, Karen, Bryan, Cindy, Kay, Dee, Don, J G, Ian, Mary, Mark, Marg, Miko, Arla, Karl, Paul, Phil, Jane, Jake, Josh, John, Joel, Sarah, Susan, Scott, Janice, and Jayson