Last name Sanwai (Sanwai 
) , in the world, is a rare family name. The cognomen Sanwai is characteristic of South-eastern Asia, particularly Myanmar, where it is a rare surname, Malaysia, where it is a very rare surname, and Thailand, where it is an extremely rare surname. In absolute terms, it most frequently occurs in Myanmar, India, and Malaysia. Also, Sanwai is the forename as well as the last name.