Family name ថ្វាយ (ถวาย 
, ថ្វាយ 
) , all around the world, is a rare surname. The last name ថ្វាយ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname, and Cambodia, where it is a very rare surname. Likewise, ថ្វាយ is the forename as well as the last name.