Surname Khamnoy (Khamnoy 
) , worldwide, is a rare family name. The cognomen Khamnoy is habitual in Laos, where it is quite a rare surname, Thailand, where it is a very rare surname, and Canada, where it is an extremely rare surname. In absolute terms, it is commonest in Laos, Thailand, and the United States. More prevalently, Khamnoy is the forename as well as the last name.