I came upon your query while I was researching my own family.
There were two branches of the family in Mullingar Co Westmeath. If you search the National Archives online you may be able to link up to your ancestors.
Killynon appears to be where the main branch lived.
You mention 1810 - Is this when your ancestor emigrated to the U.S ? Do you have a first name as a link in your ancestry ?
I have some details on the family in Westmeath but would need a christian name and period so that I could , if possible , give you a link