Kammala jumla mai zuwa: Sunan Irish na farko don shafin birni na zamani shine, Tsohon Irish don "itacen oak na Calgach", bayan arna da ba a sani ba. John Keys O'Doherty, Bishop na Roman Katolika na Derry daga 1889 zuwa 1907, ya nemi ya gano Calgach tare da abokin adawar Agricola Calgacus, yayin da Patrick Weston Joyce ya ce "Calgach", ma'ana "jarumi mai zafin rai", sunaye ne na yau da kullun. An kafa gidan sufi na Celtic Kirista a cikin karni na shida; Adomnán sunaye Saint Columba a matsayin wanda ya kafa. An canza sunan zuwa "Daire Coluimb Chille", "itacen oak na Columba", wanda aka fara ambata a cikin Annals na Ulster don 1121. Yayin da gidan sufi ya zama sananne, an rage sunan zuwa "Doire" kawai (yanzu ana furta). Wannan daga baya aka anglicised zuwa "Derry". A cikin 1604, "Derrie" an ba shi izinin sarauta na farko a matsayin birni da kamfanin gundumar ta James I na Ingila. Ƙungiyar
Cahir O'Doherty, shugaban Irish na Inishowen, ya lalata ƙauyen a shekara ta 1608.