Nyorai kupfuurira kweiyi ndima - Zita rokutanga rechiIrish renzvimbo yeguta razvino raiva, Old Irish nokuda kwe"oak wood of Calgach", pashure pomunhu asingazivikanwi wechihedheni. John Keys O'Doherty, Bhishopi weRoma Katurike weDerry kubva muna 1889 kusvika muna 1907, akatsvaka kuzivisa Calgach nemuvengi waAgricola Calgacus, nepo Patrick Weston Joyce achiti "Calgach", zvichireva kuti "murwi anotyisa", raiva zita rakajairika. Nzvimbo yemamongi yechiKristu yeCeltic yakavambwa paVatican muzana ramakore rechitanhatu; Adomnán anodana Saint Columba semuvambi. Zita racho rakachinjwa kuva "Daire Coluimb Chille", "oak wood of Columba", rakatanga kutaurwa muAnnals of Ulster muna 1121. Sezvo nzvimbo yemamongi yakakura mukurumbira, zita racho rakaderedzwa kuva "Doire" chete (zvino rinodudzwa). Ikoku gare gare kwakashandurwa kuva "Derry". Muna 1604, "Derrie" yakapiwa gwaro rayo rokutanga roumambo seguta uye county corporate naJames I weEngland. Nzvimbo yacho yakaparadzwa
muna 1608 naCahir O'Doherty, mukuru mukuru weIrish weInishowen.