Welcome to Ireland Reaching Out!
This site shows your where surnames were found in the mid-19th century. http://www.swilson.info/sdist.php You can see which counties were most prominent for Kilmartin and Gilmore.
I checked for a marriage record on Roots Ireland and did not see a record. Many parishes do not have records prior to 1850. Did they have children in Ireland?
Have you considered autosomal DNA testing?