Glanchy, MacClancy, MacFlannchadh
The name Clancy was originally a MAC name. The C of Clancy was originally the last letter of the prefix Mac. In Irish Clancy is MacFhlannchaidh – Mac meaning son of Flann meaning Reddish. The name is most commonly found today in Counties Clare, Galway and Tipperary. The only other area where the name is found in large numbers is in County Leitrim.