Last name Therasak (Therasak 
) , worldwide, is an extremely rare cognomen. The cognomen Therasak is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More prevalently, Therasak is the forename as well as the last name.
Nooim, Nuwan, Inchai, Chupong, Thankul, Tretrong, Inderis, Wanvachirakul, Suppapan, Choochai, Wonganusorn, Chaibundit, Thammasaran, Bowornwiriyaphan, and Tangpoonphonvivat