Cognomen วัฒนนาถ (Watanath 
, Watthanat , วัฒนนาถ ) , in the world, is a very rare family name. The last name วัฒนนาถ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Also, วัฒนนาถ is the forename as well as the last name.