Cognomen 大天 (Mahadeva 
, 大天 ) , all over the world, is quite a rare family name. The last name 大天 is habitual in Sri Lanka, where it is quite a rare surname, Nepal, and Australia, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Southern Asia, particularly India, Sri Lanka, and Nepal. Predominantly, 大天 is the forename as well as the last name.