Last name Rhai (ไร 
, Rhai 
) , around the world, is a rare cognomen. The cognomen Rhai is characteristic of Kuwait, where it is a rare surname, Saudi Arabia, and Thailand, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Thailand, Saudi Arabia, and Morocco. More frequently, Rhai is the forename as well as the last name.