Dair is the Irish name of the seventh letter of the Ogham alphabet, ᚇ, meaning `oak`, which is related to Welsh derw(en). Its Proto-Indo-European root was *deru- `oak`. Its phonetic value is [d]. Dair forms the basis of some first names in Irish Gaelic such as Daire, Dara, Darragh and Daragh. ... Found on http://en.wikipedia.org/wiki/Dair