Last name Sumayi (Sumayi 
) , throughout the world, is a rare surname. The family name Sumayi is characteristic of Tanzania, where it is a rare surname, Indonesia, where it is a very rare surname, and Nigeria, where it is an extremely rare surname. Measured by absolute frequency, the name is most common in Tanzania, Indonesia, and India. Much more frequently, Sumayi is the forename as well as the last name.