A helpful note from Ireland, via Ann Burns, about First Steps in Finding Your Irish Ancestors.
From irelandxo.com, the contents might not be new to everyone, perhaps these are.
Sloinne.ie a comprehensive free database of surname spelling variations and district of origin
Guide to Irish Christian Names lists the formal name and its variations to include nicknames, the Latin and the original Irish name from which they all derived.
logainm.ie – for its excellent archive of old alternative spellings and placename aliases.
If the Gaeilge stumps you there’s always Google translate.