Across the world, นิลวรรณ์ (นิลวรรณ์ 
) is a very rare mostly feminine, but seldom boy's forename. The forename นิลวรรณ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare mostly feminine, but seldom male name. Also, นิลวรรณ์ is the last name as well as the forename.