Cognomen Nilsuwan (Nilsuwan 
) , all over the world, is quite a rare last name. The surname Nilsuwan is habitual in South-eastern Asia, particularly Thailand, where it is quite a rare surname.
Mali, Pairin, Pranom, Prakob, Rawipa, Gobgoo, Lalita, Laaeid, Jariya, Namsai, Oratai, Orapin, Ongard, Mattana, Samraeng, Suwanna, Somchai, Chayada, Kumkong, Krisana, Kwandao, Patipan, Paniti, Charin, Aesana, Arthip, Saen, Sean, Bhum, Thum, Tira, Wara, Sunee, Supin, Annop, Burin, Pavinee, Pawit, Jampa, Jadej, Natee, Nirat, Wilai, Winit, Winai, Manoch, Sanong, Sakorn, Pisit, and Pittaya