I usually go by the meanings of names, aswell as the langauge/heritage they are from.
If you would like a website to look at for Irish names, I would suggest one that is linked to this website:
http://www.namenerds.com/irishThey've got LOADS of Irish names, and also links to more name sites. I've found many names for characters in stories at that site.
God bless,
MCW