Cognomen Sumalu (Sumalu 
, สุมาลุ , สุมาลุย์ ) , all over the world, is a rare family name. The surname Sumalu is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname, Indonesia, where it is a very rare surname, and Malaysia. Measured by absolute frequency, the name is most common in Thailand, Indonesia, and India. Very seldom, Sumalu is the forename as well as the last name.