Cognomen Gavn (Gagn 
, Gavn 
) , globally, is a rare last name. The cognomen Gavn is habitual in Canada, where it is a rare surname, New Zealand, where it is a very rare surname, and France, where it is an extremely rare surname. In absolute terms, it is commonest in Canada, China, and India. More frequently, Gavn is the forename as well as the last name.