My ancestor Thomas Donlan (b. 1815 in Moylough) came to America in 1840's with his sister Ellen (b. 1800) and brothers John (b. 1812) and Patrick (b. 1810). Looking for info on their parents, and would love to find any relatives still in Ireland.
I have access to the baptisms and marriage records Will check them later for Donlons
Meanwhile there are still Donlons there in 1901 http://www.census.nationalarchives.ie/pages/1901/Galway/Mount_Bellew/Mo…;
There are many variations of the name Donnellan being the most popular nowadays If you search the phone bookhttp://www.eircomphonebook.ie you will still get Donnellans who are possibly connected
Let me know if you want further assistance
Martin