A Scottish surname, McEnroe comes from the Scottish clans of Connchaidh or Duncan, which refers to a hound. Variations in spelling McEnroe include MacConkey, MacDonachie, MacConachie, MacConchie, MacConckey and MacLagan. Many McEnroe families left Scotland for Ireland to live. Those remaining lived in Dunbartonshire and Lanarkshire counties. Within England the McEnroe families are concentrated in Yorkshire, Northumberland, Lancashire and Derbyshire counties. Within the United States the McEnroe individuals live mostly in New York, Massachusetts, New Jersey, Pennsylvania, Illinois, Iowa and California. Famous: Patrick H. McEnroe (awarded the Medal of Honor during the Civil War), John Patrick McEnroe Jr. (professional tennis player, ranked in the world as number 1) and Colin McEnroe (radio personality with the Colin McEnroe Show).