Surname Nguoi (Nguoi 
, เหงียน 
) , throughout the world, is a rare family name. The surname Nguoi is characteristic of Macao, where it is quite a rare surname, Vietnam, where it is a rare surname, and Singapore. In absolute terms, this name is the most popular in South-eastern Asia, particularly Vietnam, Thailand, and Malaysia. Likewise, Nguoi is the forename as well as the last name.