Tuhia he haere tonu mo tenei waahanga - Ko te ingoa Irish tuatahi mo te waahi o te taone hou ko, Old Irish mo "oak rakau o Calgach", i muri i te karakia ke. Ko John Keys O'Doherty, te Pihopa Katorika o Derry mai i te 1889 ki te 1907, i whai ki te tautuhi i a Calgach me te hoa whawhai a Agricola a Calgacus, i te mea ko Patrick Weston Joyce e kii ana ko "Calgach", te tikanga "toa toa", he ingoa noa. I whakatuhia he whare karakia Karaitiana Celtic i te rautau ono; Ka whakaingoatia e Adomnán a Saint Columba hei kaiwhakaara. I hurihia te ingoa ki te "Daire Coluimb Chille", "oak rakau o Columba", i whakahuatia tuatahihia i roto i nga Annals o Ulster mo te 1121. I te nui haere o te rongonui o te papa monastery, ka whakaitihia te ingoa ki te "Doire" (i kiia inaianei). I muri mai ka whakaingoatia tenei ki "Derry". I te tau 1604, i whakawhiwhia ki a "Derrie" tana tuunga rangatira tuatahi hei taone nui me te kamupene kawanatanga na James I o Ingarangi. I whakangaromia te kāinga
i te tau 1608 e Cahir O'Doherty, rangatira Irish o Inishowen.