Cognomen สวาย (Sawai 
, Swai 
, สวาย ) , in all the world, is a common surname. The family name สวาย is habitual in Tanzania, where it is quite a common surname, Kenya, where it is quite a rare surname, and Oman. Not in comparison with a country's population, the name is most common in Tanzania, India, and Kenya. Likewise, สวาย is the forename as well as the last name.