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| A |
Aideen | Formed like Aidan from fire. | Aideen died of a broken heart when herr husband Oscar, a grandson of Fionn Mac Cool, died in battle. |
| B |
Barry. | Gaelic equivalent de Barra which is a Cambro-Norman name. |
71st most popular name in Ireland. |
| Boyle | Gaelic equuivalent is O Baoill vain pledge. | 47th most popular name in Ireland. | |
| Brady. | Gaelic equivalent is Mac Bradaigh spirited. | 57th most popular name in Ireland. | |
| Brown. | Gaelic equivalent is Mac an Bhreithiun son of Brehon (A Judge). |
37th most popular name in Ireland. | |
| Buckley. | Gaelic equivalent is O Buachalla cow herd. |
99th most popular name in Ireland. | |
| Byrne | Gaelic equivalent is O Broin raven. |
7th most popular name in Ireland. | |
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| C |
Casey | Gaelic equivalent is O'Cathasaigh vigilant in war or watchful. | 59th most popular name in Ireland. |
| Cathleen | English versions Catherine and Kathleen | ||
| Ciara | Other forms are Keera,Keira and Kira. | The feminine form of Ciaran, from the Irish ciar meaning "dark" | |
| Connolly | Gaelic equivalent is O'Conghaile fierce as a hound. | 23rd most common name in Ireland. | |
| Collins |
Gaelic equivalent is O Coileain young warrior. |
30th most popular name in Ireland. | |
| Cullen | Gaelic equivalent is O'Cuilinn holly. | 84th most popular name in Ireland. | |
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| D |
Dubheasa | Dubheasa 'dark beauty' | Ancient name little used now. |
| Donovan | Gaelic equivalent is O Donnabhain brown black. | 67th most popular name in Ireland. | |
| Donnelly | Gaelic equivalent is O Donnghaile brown valour. | 65th most common name in Ireland. | |
| Doyle | Gaelic equivalent is O'Dubhghaill dark foreigner. | 12th most popular name in Ireland. | |
| Duffy |
Gaelic equivalent is O Dufaigh dark or black. | 45th most common name in Ireland. |
| E |
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| F |
Flanagan |
Gaelic equivalent is O Flannagain red or ruddy. |
69th most popular name in Ireland. |
| G |
Gallagher | Gaelic equivalent is O Gallchobhair lover of foreigners. | 14th most popular name in Ireland |
| Griffin | The Welsh equivalent is Gruffudd. | 75th most popular name in Ireland. | |
| H |
Hayes | Gaelic equivalent is O'Hadha fire. |
52nd most popoular name in Ireland |
| Healy | Gaelic equivalent is O hEalaighthe artistic or scientific. |
48th most popular name in Ireland. | |
| Higgins | Gaelic equivalent is O Huiginn worthy. |
83rd most popular name in Ireland. | |
| I |
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J |
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| K |
Kennedy | Gaelic equivalent is O Cinneide helmet-headed. | 16th most popular name in Ireland. |
| Kenny | Gaelic equivalent is O'Cionaoith fire sprung. | 76th most common name in Ireland. | |
| L |
Lynch | Gaelic equivalent is O Loinsigh seafarer or exile | 17th most popular name in Ireland. |
| Lyons | Gaelic equivalent is O Laighin grey. | 80th most popular name in Ireland |
| M
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MacKenna. | Gaelic equivalent is MacCionaoith fire sprung. |
88th most popular name in Ireland |
| MacMahon | The Gaelic equivalent is MacMathuna 'Bear calf' |
64th most popular name in Ireland. | |
| MacNamara. | Gaelic equivalent is MacConmara hound of the sea. |
94th most popular name in Ireland. | |
| Maher | Gaelic equivalent is Meagher fine and majestic. | 87th most popular name in Ireland. | |
| Molony. | Gaelic equivalent is O'Maolomhnaigh 'Servant of the Church' |
97th most popular name in Ireland. | |
| MacDermott | Gaelic equivalent is MacDiarmada 'F ree from jealousy' |
96th most popular name in Ireland. | |
| McCabe | Means son of Cabe. | Caob, Gaelic, a bough, branch, a clod, lump, a bit or piece of any thing. Ceap, the top of a hill, a sign set up in time of battle. | |
| McDonagh |
Gaelic MacDonnchadha. | Variants include MacDonogh, Donaghy and McDonough | |
| Moore | Gaelic equivalent is O'Mordha majestic. | 20th most popular name in Ireland. | |
| Moran | Gaelic equivalent is O'Morain great. |
56th most popular name in Ireland. | |
| Murray | Gaelic equivalent is O'Muireadhaigh lord or master. | 18th most popular name in Ireland. | |
| McLoughlin |
Gaelic equivalent is MacLochlainn viking. | 21st most popular name in Ireland. |
| N |
| O |
O'Brien | Gaelic equivalent is O Briain high and noble. | 6th most popular name in Ireland. |
| O'Carroll. | Gaelic equivalent is O Cearbhaill fearless in battle. |
22nd most popular name in Ireland. | |
| O'Connell | Gaelic equivalent is O Conaill strong as a wolf. |
25th most popular name in Ireland. | |
| O'Connor | The Gaelic equivalent is O'Conchobhair patron of warriors. | 9th most popular name in Ireland. | |
| O'Neill | It comes from Niall of the Nine Hostages. | 10th most popular name in Ireland | |
| O'Dwyer | Gaelic equivalent is O Dubhuir black. | 100th most popular name in Ireland. | |
| O'Mahony | Gaelic equivalent is O Mathuna bear calf. | 46th most common name in Ireland. | |
| Orlaith | Orlaith or Orlagh golden princess | The name was shared by both a sister and a daughter Brian Boru | |
| O'Sullivan | Gaelic equivalent is O'Suilleabhain dark-eyed. | 3rd most common name in Ireland. | |
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| P |
Patricia | From the latin "noble; patrician". Feminine form of Patrick. |
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| Power | The Gaelic equivalent is de Paor the poor man. | 54th most popular name in Ireland. | |
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| Q |
Quinn | The Gaelic equivalent is O Cuinn Lord or Master. | 19th most popular name in Ireland. |
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| R |
Regan | Gaelic equivalent is O'Riagain little king. | 66th most popular name in Ireland. |
| Ryan | Gaelic equivalent is O'Maoilriain king. | 8th most popular name in Ireland. | |
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| S |
Shauna | Shauna the feminine form of Sean |
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| Sheehan | Gaelic equivalent is O'Siodhachain peaceful. | 77th most popular name in Ireland. | |
| Sheila | Sile or Sheelagh Other forms Sheila, Sheela | ||
| Smith | Gaelic equivalent is MacGabhann son of the smith. |
5th most popular name in Ireland. | |
| Sweeney |
The Gaelic equivalent is Mac Suibhne pleasant |
51st most popular name in Ireland. |
| T |
| U |
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| W |
Walsh | Gaelic equivalent is Breathnach Welshman. | 4th most popular name in Ireland. |
| Whelan | Gaelic equivalent is O'Faolain wolf. | 79th most common name in Ireland. | |
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White |
Gaelic equivalent is Mac Giolla Bhain of a fair complexion | 50th most popular name in Ireland. |
| Y |