English words from Old Irish
- mainOf chief or leading importance; prime, principal.
- manAn adult male human.
- hairA pigmented filament of keratin which grows from a follicle on the skin of humans and other mammals.
- maineA state of the United States. Capital: Augusta. Largest city: Portland.
- KennethA male given name from Scottish Gaelic, originally used in Scotland, popular in all English-speaking countries in the 20th century.
- hareAny of several plant-eating mammals of the genus Lepus, similar to a rabbit, but larger and with longer ears.
- MunsterThe southernmost province of Ireland.
- ErcA member of the conspiracy that killed Cúchulainn, but was killed by his second cousin Conall the Victorious. Son of Cairbre Nia Fer and brother of Achall.
- DeclanA male given name from Old Irish, borne notably by Declán of Ardmore
- fidA pointed tool without any sharp edges, used in weaving or knotwork to tighten and form up weaves or complex knots; used in sailing ships to open the strands of a rope before splicing.
- LeinsterThe most populated province of Ireland, situated in the east of the island.
- balmoralA Scottish cap with a flat top and a plume but no brim; a blue bonnet.
- rathA walled enclosure, especially in Ireland; a ringfort built sometime between the Iron Age and the Viking Age.
- emerA female given name from Old Irish.
- CormacA male given name from Irish.
- durrA surname.
- ConnachtThe western province of Ireland, inclusive of the counties Galway, Leitrim, Mayo, Roscommon, and Sligo.
- rannA stanza of Irish poetry.
- haughA low-lying meadow by the side of a river.
- ImbolcA Gaelic and Wiccan festival celebrated on 1 or 2 February which marks the beginning of spring.
- micawberA person who is poor but eternally optimistic, believing that "something will turn up", like the fictional character Wilkins Micawber in the 1850 Charles Dickens novel David Copperfield.
- pookaA fairy that supposedly appears in animal form, often large.
- RavenglassA coastal village in Muncaster parish, Cumberland, Cumbria, England, previously in Copeland borough (OS grid ref SD0896).
- quaffTo drink or imbibe with vigour or relish; to drink copiously; to swallow in large draughts.
- DagdaAn important god in Irish mythology, portrayed as a father figure, king, and druid.
- DalriadaA Gaelic overkingdom that included parts of western Scotland and northeastern Ulster in Ireland, across the North Channel.
- BalgonieA castle in Aberdeenshire, Scotland
- AllardiceA surname.
- AdamnanAn Irish saint (c. 624–704), patron saint of the Diocese of Raphoe, the biographer of St. Columba and an acquaintance of the Venerable Bede.
- AífeA female warrior from Alba (Scotland), the daughter of Airdgeimm and sister of Scáthach, who became Cú Chulainn's lover; featured in the Ulster Cycle.
- AirgiallaA medieval overkingdom encompassing present-day Ireland.
- CarperbyA village in Carperby-cum-Thoresby parish, Richmondshire district, North Yorkshire, England (OS grid ref SE0089).
- Castle EdenA village and civil parish in County Durham, England (OS grid ref NZ4237).
- CormagA surname from Irish.
- Cú ChulainnThe pre-eminent hero of Ulster in the Ulster Cycle, almost undefeatable due to his spear the Gae Bulg, but cursed to reach an early grave; son of Lugh and Deichtine.
- CuldeeOne of a class of anchorites who lived in various parts of Scotland, Ireland, and Wales in the Middle Ages.
- erenaghThe head of a clan occupying church lands under a bishop in Gaelic Ireland.
- FixbyA suburb of Huddersfield in the Metropolitan Borough of Kirklees, West Yorkshire, England.
- GoidelA Gael; a member of the Goidelic division of Celtic languages as opposed to the Brythonic division.
- GoosnarghA village and civil parish in Preston district, Lancashire, England; most of the village is in Whittingham parish (OS grid ref SD5536).
- immramAn Old Irish tale of a sea voyage to a mythical land.
- tuathA tribe or group of people in Ireland, having a loose voluntary system of governance entered into through contracts by all members.