All around the world, Fiachra (Fiachra 
) is a rare boy's forename. The first name Fiachra is habitual in Northern Europe, particularly Ireland, where it is quite a rare boy's name, and the United Kingdom, where it is a very rare male name.
| VARIANT | COUNTRY |
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| Fiachra | Ireland, Australia, United States, United Kingdom, Spain |
| fiachra mac colmain Bishop of Armagh from 548 to 558 (b. 500) |
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| fiachra terence wilbraham trench-mcmahon (born 1941) (b. 1941) |
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| fiachra cossalach King of the Cruthin |
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| fiachra humphries researcher |
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| fiachra knox Ph.D. University of Birmingham 2013 |
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| fiachra o'flynn Peerage person ID=544047 |
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| fiachra e rowan researcher |
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| fiachra moloney researcher (ORCID 0000-0003-1861-2884) |
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| fiachra ó corragáin Irish musician |
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| fiachra ua focarta Irish abbot |
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| fiachra o'brolcháin researcher |
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| fiachra mac gabhann IE (b. 1971) |
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| fiachra cáech |
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In, Lennon, Hughes, Walshe, Moloney, Sweeney, Collins, Crowley, Kearney, O'Leary, Mccarthy, Mccarron, Sheridan, Callanan, Kavanagh, Grisewood, Oconnell, O'Connor, Gallagher, Hallissey, Osullivan, O'Donnell, Garvey, Devlin, Keenan, Stokes, Bell, Daly, Maher, Mahon, Moran, Smith, Carey, Coyne, Byrne, Kelly, Mcloughlin, Keane, Glynn, Lynch, Judge, Hayes, Walsh, White, Quinn, Malone, Murray, Murphy, Doyle, and Cunningham