Here are some links which include some history on the Colton name as well as an English coat of arms -
http://www.houseofnames.com/xq/asp.c/qx/colton-coat-arms.htmhttp://www.chriscolton.co.uk/CoatArms.htmhttp://freepages.genealogy.rootsweb.ancestry.com/~coltoninfo...The name Colton is also noted in the Domesday book dating back to 1085 in England.
I think it's safe to say that any Irish Coltons probably can trace some lineage to that.