Orr A Scottish surname derived from the Gaelic odhar meaning ‘of sallow complection’. The surname was to be found in the parish of Lochwinnoch in Renfrewshire (a sept of the Campbells), and in Campbeltown, Kintyre. In 1890 the surname was principally found in Antrim, Down, Derry and Tyrone, and the estimated number of bearers was 3,270. In the United States it is the 636th most numerous surname with an estimated 52,250 bearers.