Last name Sinra (สินรา 
, Sinra 
) , in the world, is a rare family name. The cognomen Sinra is characteristic of Thailand, where it is a rare surname, Indonesia, where it is a very rare surname, and South Africa. Not in comparison with a country's population, it is commonest in Thailand, Indonesia, and India. Very seldom, Sinra is the forename as well as the last name.