Family name Tatsanai (ทัศนัย 
, ทัศไนย , Tatsanai ) , in all the world, is a rare cognomen. The last name Tatsanai is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. More prevalently, Tatsanai is the forename as well as the last name.
Janin, Naumnakha, Na Nakorn, Nuamnakha, Ekvanakul, Ekvanakun, Chaikhieo, Thonghun, Choocherd, Norrasing, Suwannarat, Khamwongsa, Wongpisethkul, Pattanakaew, Thammachoto, Kieomaneenai, Taesujariya, Janhnong, Aimampant, Saelee, Bualret, Plewma, Nakniyom, Hongsa, Sornard, Sribang, Chailom, Borisut, Bualert, Ritborirak, Jinakiaw, Noyjinda, Yongkai, Sinakorn, Sattayaraksa, and Maneewongwattana