Family name Lôn (Loan 
, Lôn) , across the world, is a common surname. The family name Lôn is habitual in Vietnam, where it is quite a common surname, Macao, and Malaysia, where it is quite a rare surname. In absolute terms, it is commonest in South-eastern Asia, particularly Vietnam, Malaysia, and Indonesia. Very seldom, Lôn is the forename as well as the last name.