Cognomen Thongthae (Thongthae 
, ถ่องแท้) , around the world, is a rare surname. The family name Thongthae is habitual in Thailand, where it is a rare surname, and the United Kingdom, where it is an extremely rare surname. Much less frequently, Thongthae is the forename as well as the last name.
Manu, Aphirak, Chanpen, Charuni, Bunkuea, Kitsana, Polawit, Jantana, Jamrean, Jirapat, Nalinee, Nuttkawee, Witsanu, Worarat, Montinee, Somrudee, Somchuea, Arichaiwat, Kittinat, Parichat, Panisara, Peerawit, Adisorn, Amonwan, Sophida, Somboon, Laai, Sunee, Suwan, Buris, Pooke, Rujee, Jayne, Nikom, Nirut, Nisai, Piyaphon, Suriya, Sombut, Anurak, Aunnop, Apisit, Pintip, Thomya, Natcha, Wasana, Sarawut, Sudakan, Suphon, and Puttipat