Across the world, Diarmaid (Dermot 
, Diarmaid 
) is quite a common male first name. The first name Diarmaid is characteristic of Ireland, where it is quite a common male name, the United Kingdom, where it is quite a rare male name, and Australia. Measured by absolute frequency, it is commonest in Ireland, the United Kingdom, and the United States. Much less frequently, Diarmaid is the last name as well as the forename.
| diarmaid mac madudan Irish king (b. 1032) |
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diarmaid macculloch British historian, GB (b. 1951) |
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| diarmaid ó súilleabháin roman-catholic bishop (1924-1994) (b. 1924) |
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| diarmaid murtagh Irish actor, IE (b. 1953) |
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| diarmaid ferriter professor, IE (b. 1973) |
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| diarmaid ó cellaigh Irish king |
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| diarmaid o’raghallaigh Roman Catholic bishop |
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| diarmaid ó donnchadha Roman Catholic bishop |
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| diarmaid ua madadhan King of Síol Anmchadha and Uí Maine |
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| diarmaid stokes researcher |
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| diarmaid mac tadgh ua ceallaigh King of Ui Maine |
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| diarmaid d houlihan researcher |
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| diarmaid cleirech ua madadhan Irish king |
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| diarmaid the just Irish confessor, IE |
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| diarmaid riabach ó seachnasaigh Irish Chief of the Name |
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Fee, Mulcahy, Mcmanus, Carroll, Collins, Brennan, Kiernan, Doherty, Mcgregor, Sheridan, Campbell, Colreavy, Thompson, Odonghaile, O'Connor, O'Keeffe, Williams, Mcmenamin, Gallagher, Osullivan, Macculloch, Mccafferty, Walshe, Frates, Hyland, Lawlor, Ryan, Long, Smyth, Barry, Brown, Byrne, Kelly, Keane, Roche, Drumm, Fitzgerald, Joyce, Healy, Flynn, Foley, Walsh, Malone, Murray, Murphy, Mclean, Conaty, Cleary, Neill, and O'Sullivan