Cognomen Promsarn (Promsarn 
) , in the entire world, is a rare family name. The family name Promsarn is habitual in Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname.
Sai, Ruethairat, Pattareeya, Thananikorn, Nattikan, Teerayut, Kanpirom, Somphong, Ruephatrat, Piyanat, Pantipa, Pariwat, Apichat, Atinuch, Sompong, Sanya, Jongkolnee, and Phongsathorn