Family name Yotsak (Yotsak 
) , around the globe, is a very rare cognomen. The last name Yotsak is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. More prevalently, Yotsak is the forename as well as the last name.
Kaewpoo, Kongwithayanont, Kaewbangkirt, Nuanlaong, Phichetbovornkul, Patomvorachart, Mongkoanpanyalert, Udomsint, Thongkhu, Kangkasuwan, Choobour, Chaowana, Sripanya, Sukkasem, Wansong, Ngothong, Khajonkulwanit, and Juntarasriwong