Cognomen 莱登 (Lydon 
, Lyden 
, Ledon ) , in the world, is a common surname. The cognomen 莱登 is characteristic of Ireland, where it is quite a common surname, the United Kingdom, where it is quite a rare surname, and the United States. In absolute terms, it is commonest in the United States, the United Kingdom, and Mexico. Very seldom, 莱登 is the forename as well as the last name.