Cognomen Thra (Thra 
, ทรา 
, ทาง ) , throughout the world, is a rare family name. The cognomen Thra is habitual in Greece, where it is quite a rare surname, Myanmar, where it is a rare surname, and Malaysia, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in India, Myanmar, and Greece. Likewise, Thra is the forename as well as the last name.