Family name Thongthaen (Thongthaen 
) , around the globe, is a very rare surname. The last name Thongthaen is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, Thongthaen is the forename as well as the last name.
Chirapa, Nitinai, Teerapat, Nattawit, Natthariga, and Boonyaporn