Surname Reungsak (Reungsak 
) , in all the world, is an extremely rare family name. Much more frequently, Reungsak is the forename as well as the last name.
Kruon, Junkong, Sangchan, Charusen, Janpitak, Vonglersak, Singkarnjanarod, Suphongwiboolpan, Akarawacharangkoon, Suwansatiean, Charounsuk, and Srisuriyawan