Surname Thongroj (Thongroj 
) , in all the world, is a very rare family name. The cognomen Thongroj is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
Phathu, Teerin, Kewalee, Prasert, Rujiras, Peerapan, Nattaporn, Phantarakamol, Pacharaphon, and Natthayanan