Coal town or Coles settlement
Derived from an English surname, it originally served as a habitational name for someone from various places in England. It likely stems from the Old English personal name Cola, meaning charcoal, combined with 'tun', meaning settlement or enclosure.
Less common today
Coulton isn't in the latest US Top 1000. It last peaked at #5,468 in 1991.
US births per 5-year period, 1990βpresent (SSA data).