Family name นิลวัฒน์ (นิลวัฒน์ 
, Nilawat 
, Nilwat ) , across the world, is a rare cognomen. The family name นิลวัฒน์ is habitual in Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname. Likewise, นิลวัฒน์ is the forename as well as the last name.