Family name Седдон (Seddon 
, Седдон 
) , throughout the world, is quite a common surname. The cognomen Седдон is characteristic of the United Kingdom, where it is quite a rare surname, New Zealand, and Australia. Not in comparison with a country's population, this name is the most popular in the United Kingdom, the United States, and Australia. Very seldom, Седдон is the forename as well as the last name.