Diarmaid (Irish pronunciation: [dʲiəɾˠ.mˠədʲ]) is a masculine given name in the Irish language. Earlier forms of the name include Diarmit and Diarmuit. Variations of the name include Diarmait and Diarmuid. Anglicised forms of the name include Dermot (//, or Hiberno-English //) and Dermod. Mac Diarmata, anglicised McDermot and similar, is the the patronymic and surname derived from the personal name. The etymology of the name is uncertain. There is a possibility that the name is derived in part from dí, which means "without"; and either from airmit, which means "injunction", or airmait, which means "envy". The Scottish Gaelic form of the name is Diarmad; Anglicised forms of this name include Diarmid and Dermid. Another Anglicised form of Diarmaid is Jeremiah.
- Diarmaid Mac an Bhaird (fl. 1670) Irish poet
- Diarmaid Blake Gaelic footballer
- Diarmaid MacCulloch (born 1951) British church historian
- Diarmaid the Just (Irish abbot
- Diarmaid Ó Donnchadha (fl. 1418) Bishop of Kilmacduagh
- Diarmaid FitzGerald (born 1983) Irish hurler
- Diarmaid Riabach Ó Seachnasaigh (died 1579) Irish chief
- Diarmaid mac Madudan (fl.1032-1069) Chief of Síol Anmchadha
- Diarmaid Ua Madadhan (died 1135) King of Síol Anmchadha and Uí Maine
- Diarmaid Ó Cellaigh (died c.1349) King of Uí Maine
- Diarmaid Ó Seachnasaigh (died before 1567) Irish knight
- Diarmaid Ferriter (born 1973) Irish historian
- Diarmaid Cleirech Ua Madadhan (died 1207) King of Síol Anmchadha
- Diarmaid mac Tadgh Ua Ceallaigh (died 1065) King of Uí Maine
- Diarmaid Ó Máille (died 1415) Irish chief
- Diarmaid Ó Cúlacháin (died 1221) Irish historian and scribe
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- Diarmait mac Cerbaill, King of Tara, died 565
- Diarmait mac Áedo Sláine, Co-king of Tara, died 664
- Diarmait ua Tigernáin, abbot of Armagh, died 852
- Diarmait mac Máel na mBó, King of Leinster, died 1072
- Diarmait mac Murchada, King of Leinster, died 1171
- Diarmait of Iona
- Diarmait mac Conaing
- Diarmait mac Tommaltaig
- Diarmait Dian
- Diarmait ua Tigernáin
- Diarmait Ó Cobhthaigh
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- Diarmuid Ua Duibhne, a warrior in Irish mythology
- Diarmuid Byron O'Connor, British Sculptor
- Diarmuid Martin (born 1945), Roman Catholic Archbishop of Dublin and Primate of Ireland
- Diarmuid Gavin (born 1964), Irish garden designer and television personality
- Diarmuid O'Sullivan (born 1978), Irish sportsperson
- Diarmuid O'Scannlain (born 1937) American jurist (United States Court of Appeals for the Ninth Circuit)
- Diarmuid Hegarty (Griffith College), Irish academic; president of Griffith College, Dublin
- Diarmuid Connolly (born 1987), Dublin Gaelic football player; hurling player
- Diarmuid O'Carroll (born 1987), Irish professional footballer
- Diarmuid Lynch (1878–1950), Irish Republican Brotherhood member; Sinn Féin member
- Diarmuid Murphy (born 1975), Irish sportsperson.
- Diarmuid Lawrence (born 1947), British television director
- Diarmuid Lyng (born 1981), Irish sportsperson
- Diarmuid O'Neill (1969–1996), Provisional Irish Republican Army member
- Diarmuid O'Hegarty, Irish revolutionary and civil servant
- Diarmuid Kirwan, Irish hurling referee
- Sir Diarmuid Downs (born 1922), British automotive engineer
- Diarmuid Wilson (born 1965), Irish Fianna Fáil politician and member of Seanad Éireann
- Diarmuid Dalton, British bass guitarist
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- Diarmuid Ua Duibhne, hero of The Pursuit of Diarmuid and Gráinne
- Dermot O'Leary, English television presenter
- Dermot Morgan, Irish comedian
- Dermot Mulroney, American actor
- Dermot Patterson, British architect
- Dermott Brereton, Australian sportsperson
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- Dermod Dwyer, Irish businessman
- Dermod O'Brien (1865-1945) Anglo-Irish painter
- Dermod O'Brien, 2nd Baron Inchiquin (died 1557)
- Dermod O'Brien, 5th Baron Inchiquin (1594–1624)
- Dermod O'Meara (fl.1619) Irish physician and poet
- All pages with titles containing "Dermod"
- Hanks, Patrick; Hardcastle, Kate; Hodges, Flavia (2006), A Dictionary of First Names, Oxford Paperback Reference (2nd ed.), Oxford University Press, pp. 74, 345, ISBN 978-0-19-861060-1.
- Hanks, Patrick; Hardcastle, Kate; Hodges, Flavia (2006), A Dictionary of First Names, Oxford Paperback Reference (2nd ed.), Oxford University Press, p. 401, ISBN 978-0-19-861060-1.
- Macleod, I; Freedman, T (1995). The Wordsworth Dictionary of First Names. Wordsworth Reference. Ware, HD: Wordsworth Editions. p. 113. ISBN 1-85326-366-4 – via Google Books.
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