Family name Yuttajak (Yuttajak 
) , in all the world, is an extremely rare last name. Much more prevalently, Yuttajak is the forename as well as the last name.
Malai, Suwannarat, Namcharoen, Thongkaew, Juntapoon, Ruangdachawiwat, Phiromrak, Wongboon, Somsamai, Yasrakoo, Neranon, Nonsaket, Chaenin, Sopabut, Suvanta, Sukkong, Manomai, Potong, Kunket, Nojit, Wongsarapee, and Wongwattana