Last name น้ำแก้ว (Namkaeo 
, น้ำแก้ว, Namgaew ) , throughout the world, is a rare surname. The cognomen น้ำแก้ว is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname, Myanmar, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. Much less frequently, น้ำแก้ว is the forename as well as the last name.