Family name Chalermsak (Chalermsak 
) , worldwide, is a very rare surname. The cognomen Chalermsak is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much more frequently, Chalermsak is the forename as well as the last name.
Saita, Dulyakup, Taweetong, Thongrak, Tooltongpetch, Sriwichai, Chittanon, Kanteetaw, Lengthong, Jindamang, Tuntijareonwiwat, Uttarakat, Phuangphae, Lertwongsatien, Tangprasomsuk, Temboonsak, Intarasiri, Kittitrakul, Pornpawitkun, Ruengratanapong, Tangchivawattanakul, Thongnueaorn, Panmanee, Kerdchok, Boonpong, Angsupan, Seeda, Ponil, Insak, Metipgit, Aukkee, Thongo, Toomhirun, Tiwutanon, Hangam, Bhootiemsri, Wongsiriwat, Kumphan, Pimolsri, Pikunsri, Rodkliang, Jakkarn, Taksadipong, Tumsorn, Vongmuang, Uisakul, Makmoolphol, Saenglee, Peeromyaporn, and Likhitwattanachai