Its meaning differs based on the hanja used to write it.
Each has one bon-gwan: for the former, Boseong, Jeollanam-do, and for the latter, Jinseong, Jinju, Gyeongsangnam-do, both in what is today South Korea.
[1] The 2000 South Korean census found 38,849 people with these family names.
[2] In a study by the National Institute of the Korean Language based on 2007 application data for South Korean passports, it was found that 60.7% of people with this surname spelled it in Latin letters as Sun in their passports, while another 39.2% spelled it as Seon.
[3] People with this family name include: There are 41 hanja with the reading "seon" on the South Korean government's official list of hanja which may be registered for use in given names; they are listed in the table at right.