Cognomen Thongjaroen (Thongjaroen 
) , globally, is a rare last name. The last name Thongjaroen is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname, and Malaysia, where it is an extremely rare surname. Much less frequently, Thongjaroen is the forename as well as the last name.
Phua, Patcharakorn, Pongsatorn, Natthanan, Thitaporn, Weerasak, Warissra, Nopparat, Thanawat, Danusorn, Pawatpong, Chanutda, Surachet, Nuttida, Janjira, Rungsun, Phimpha, Passana, Sakon, Padol, Ladda, Nicha, Vilai, Somkid, Phongsaphak, Somrak, Panida, Nummon, Wandee, Saharat, Somboon, Patsara, Kampee, and Phrakhrusoponpunyavoravat