McCartan is a surname of Irish origins. Derived from Mac Artáin, which denotes the son of Artán, the surname was taken by chiefs of Kinelarty in County Down. The surname was thought to have lost its prefix to become Carton, Cartin, Carten and Cartan. but these names are now recognised as derivatives of Uí Mhic Cairthinn.
The McCartans belong to the Uí Echach Cobo branch of the Dál nAraidi dynasty of the Cruthin, and thus are kin to the Magennis family, Lords of Iveagh. In fact the McCartans were briefly Lords of Iveagh themselves. French President Charles de Gaulle was descended from the clan through his great-grandmother Angélique McCartan.
- Edward McCartan
- Jack McCartan
- James McCartan, Senior
- James McCartan, Junior
- Pat McCartan
- Patrick McCartan
- Arthur Guinness, believed to have McCartan origins 
- Guinness family, the prominent Anglo-Irish family
- Earl of Iveagh
- Neafsey, E. All New Surnames of Ireland (Dublin, 2002) ISBN 0-940134-97-7