Kings of Uí Failghe (Gaels of Ireland)
An ancient kingdom whose borders are largely mirrored in the modern County Offaly.
The modern name Offaly is most likely to be a mangled Anglo-Norman version of the
Gaelic original, Failghe. The 'f' would have been a 'v' in prehistory and before
that a 'w' sound (the
in common Celtic.
The '-ghe' suffix is less clear, possibly a form of '-ig' and/or '-/ic'? If the
latter, then Wallic (equivalent to 'Welsh', 'Gallish') might be the name's oldest
(Additional information by Edward Dawson.)