Looking for Curran Somerville

I am trying to find my great-great grandfather who is listed on a family marriage certificate as "Curran Somerville". According to the marriage certificate of his daughter (Sarah Eliza Somerville - born in Co. Monaghan, Ireland) his approximate birth year would have been 1799 to 1805.  I have no idea if he was born in Scotland or Ireland.  Hoping someone in Curran-land might have a suggestion or comment.  Thanks for your time!