There is a historical blog about Athy http://athyeyeonthepast.blogspot.co.uk/ It may have something. Be warned you will have to trawl through references about the Gordon Bennett motor race to find your Bennetts though!

http://www.athyheritagecentre-museum.ie/ is the website of the local heritage centre and http://www.kildare.ie/library/ehistory/genealogyfamily_histo... is full of local genealogical information.