Throughout the world, Седдон (Seddon 
, Седдон 
) is a very rare mostly masculine, but seldom girly first name. The forename Седдон is characteristic of Australia, where it is a very rare boy's name, and the United States, where it is an extremely rare predominantly masculine, but very infrequently female name. Much more prevalently, Седдон is the last name as well as the forename.