Possibly the swiftest route to your roots.
Irish genealogy website directory.
www.irishsurnames.com/gaelicmeaning.htm
Description:
It is a help when tracing your family history to know something about the origin of and evolution of Irish names and particularly how names have changed over the centuries. Early times: In ancient Ireland the population was much smaller than today and the mass movement of people was uncommon. It was usual therefore for a person to be known only by one name: Niall, Eoin, Art, etc. Once there was no one else in the locality with the same name then this was not a problem.