Surname ทองอยู่ (Thongyoo 
, Thongyu 
, ทองอยู่) , across the world, is quite a rare last name. The surname ทองอยู่ is characteristic of Thailand, where it is quite a rare surname, Malaysia, where it is an extremely rare surname, and the United States. Much less frequently, ทองอยู่ is the forename as well as the last name.