Family name Ratchasit (Ratchasit 
, รัชชสิทธิ์ , รัชสิทธิ์ ) , in the entire world, is a very rare last name. The surname Ratchasit is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. More prevalently, Ratchasit is the forename as well as the last name.
Liabwilai, Patthanapong, Thanasuwaset, Supattanarnon, Lertritsoonthonthada, Lertkantraphong, Lertsappawut, Munkongtanasup, Ueathanapong, Wanichnitikul, Hirunboonyapong, Nitipornkanlayanin, Amornpornwiwat, Suksaardworawong, Sakulkong, Methangkura, Piamrojanaphat, Khamsoncharoen, Benjalaoharat, Somreangrat, Sereekul, Meeratsameesakul, Navatthanathavorn, Ketkaew, Katkaew, Chaitep, Siricharoenpanich, and Akkarawattanalert