Cognomen Suwanjan (Suwanjan 
) , in the entire world, is a rare surname. The last name Suwanjan is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname.
Sopon, Puttipong, Kantapong, Suchanard, Supornchai, Yutthana, Naphasporn, Taweesak, Jakkarin, Phongsri, Picharat, Chalalai, Supreeya, Saowanit, Thanabodee, Jutarat, Piyanut, Panuwat, Ketsuda, Koranit, Agachai, Sompoch, Sakapol, Wanpen, Wanida, Busara, Amporn, Tidet, Pirun, Jaruwan, and Nitchakarn