Cognomen Somthawil (Somthawil 
) , worldwide, is a very rare surname. The cognomen Somthawil is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More frequently, Somthawil is the forename as well as the last name.
Srikao, Phumipakdi, Phumipakdee, Kaitwatcharachai, Somboonkit, Sinsathitchai, Hiranayajatri, Tipprasert, Sapchukun, Phromjan, Potranan, Kuwatthanapaisan, Chummung, Inthapunya, Saithong, Painter, Pangarm, Klunkoed, Klongyai, Ketkaew, Boonmee, Srikaow, Sirisri, Saisorn, Thobut, Piayura, Bukgen, Thurapra, and Boonsiripiphat