Cognomen Ngouan (Ngouan 
) , around the world, is quite a rare family name. The cognomen Ngouan is characteristic of Ivory Coast, where it is quite a rare surname, the Democratic Republic of the Congo, where it is a rare surname, and the United Kingdom, where it is an extremely rare surname. Measured by absolute frequency, this name is the most popular in Ivory Coast, the Democratic Republic of the Congo, and the United States. Very seldom, Ngouan is the forename as well as the last name.