Cognomen สุทธนา (Suttana 
, สุทธนา , Sutthana ) , all over the world, is a rare family name. The surname สุทธนา is habitual in Thailand, where it is a rare surname, Australia, where it is a very rare surname, and India, where it is an extremely rare surname. In absolute terms, it is the most numerous in Thailand, India, and Brazil. Also, สุทธนา is the forename as well as the last name.