| Rank | Name | Gaelic Equivalent | Meaning |
| 1 | Murphy | ó Murchadha | sea-battler |
| 2 | Kelly | ó Ceallaigh | bright-headed |
| 3 | O'Sullivan | ó Súilleabháin | dark-eyed |
| 4 | Walsh | Breathnach | Welshman |
| 5 | Smith | Mac Gabhann | son of the smith |
| 6 | O'Brien | ó Briain | high, noble |
| 7 | Byrne | ó Broin | a raven |
| 8 | Ryan | ó Maoilriain | king |
| 9 | O'Connor | ó Conchobhair | patron of warriors |
| 10 | O'Neill | ó Néill | from Niall of
the Nine Hostages |
| 11 | O'Reilly | ó Raghallaigh | - |
| 12 | Doyle | ó Dubhghaill | dark foreigner |
| 13 | McCarthy | Mac Carthaigh | loving person |
| 14 | Gallagher | ó Gallchobhair | lover of foreigners |
| 15 | O'Doherty | ó Dochartaigh | hurtful |
| 16 | Kennedy | ó Cinnéide | helmet headed |
| 17 | Lynch | ó Loinsigh | seafarer, exile |
| 18 | Murray | ó Muireadhaigh | lord, master |
| 19 | Quinn | ó Cuinn | wisdom, chief |
| 20 | Moore | ó Mordha | majestic |
| 21 | McLoughlin | Mac Lochlainn | viking |
| 22 | O'Carroll | ó Cearbhaill | valorous in battle |
| 23 | Connolly | ó Conghaile | fierce as a hound |
| 24 | Daly | ó Dálaigh | assembles frequently |
| 25 | O'Connell | ó Conaill | strong as a wolf |
| 26 | Wilson | Mac Liam | son of William |
| 27 | Dunne | ó Duinn | brown |
| 28 | Brennan | ó Braonáin | sorrow |
| 29 | Burke | de Búrca | from Richard de Burgh |
| 30 | Collins | ó Coileáin | young warrior |
| 31 | Campbell | - | crooked mouth |
| 32 | Clarke | óCléirigh | clergyman |
| 33 | Johnston | Mac Seáin | son of John |
| 34 | Hughes | ó hAodha | fire |
| 35 | O'Farrell | ó Fearghail | man of valour |
| 36 | Fitzgerald | Mac Gearailt | spear rule |
| 37 | Brown | Mac an Bhreithiún | son of the brehon (judge) |
| 38 | Martin | Mac Giolla Mháirtín | devotee of Saint Martin |
| 39 | Maguire | Mag Uidhir | dun-coloured |
| 40 | Nolan | ó Nualláin | famous |
| 41 | Flynn | ó Floinn | bright red |
| 42 | Thompson | Mac Tomáis | son of Thom |
| 43 | O'Callaghan | ó Ceallacháin | bright headed |
| 44 | O'Donnell | ó Domhnaill | world-mighty |
| 45 | Duffy | ó Dufaigh | dark, black |
| 46 | O'Mahony | ó Mathúna | bear-calf |
| 47 | Boyle | ó Baoill | vain pledge |
| 48 | Healy | ó hÉalaighthe | artistic, scientific |
| 49 | O'Shea | ó Séaghdha | fine, stately |
| 50 | White | Mac Giolla Bháin | of fair complexion |
| 51 | Sweeney | Mac Suibhne | pleasant |
| 52 | Hayes | ó hAodha | fire |
| 53 | Kavanagh | Caomhánach | comely, mild |
| 54 | Power | de Paor | the poor man |
| 55 | McGrath | Mac Craith | son of grace |
| 56 | Moran | ó Móráin | great |
| 57 | Brady | Mac Brádaigh | spirited |
| 58 | Stewart | Stiobhard | one who superintends |
| 59 | Casey | ó Cathasaigh | vigilant in war, watchful |
| 60 | Foley | ó Foghladh | a plunderer |
| 61 | Fitzpatrick | Mac Giolla Phádraig | devotee of Saint Patrick |
| 62 | O'Leary | ó Laoghaire | calf-herd |
| 63 | McDonnell | Mac Domhnaill | world-mighty |
| 64 | MacMahon | Mac Mathúna | bear-calf |
| 65 | Donnelly | ó Donnghaile | brown valour |
| 66 | Regan | ó Riagáin | little king |
| 67 | Donovan | ó Donnabháin | brown, black |
| 68 | Burns | - | from Scottish Burness |
| 69 | Flanagan | ó Flannagáin | red, ruddy |
| 70 | Mullan | ó Maoláin | bald |
| 71 | Barry | de Barra | Cambro-Norman name |
| 72 | Kane | ó Catháin | battler |
| 73 | Robinson | - | son of Robert |
| 74 | Cunningham | - | Scottish name |
| 75 | Griffin | ó Gríofa | Welsh: Gruffudd |
| 76 | Kenny | ó Cionaoith | fire sprung |
| 77 | Sheehan | O'Siodhachain | peaceful |
| 78 | Ward | Mac an Bhaird | son of the bard |
| 79 | Whelan | ó Faoláin | wolf |
| 80 | Lyons | ó Laighin | grey |
| 81 | Reid | - | red haired,
ruddy complexion |
| 82 | Graham | - | grey home |
| 83 | Higgins | ó hUiginn | - |
| 84 | Cullen | ó Cuilinn | holly |
| 85 | Keane | Mac Catháin | - |
| 86 | King | ó Cionga | - |
| 87 | Maher | Meagher | fine, majestic |
| 88 | MacKenna | Mac Cionaoith | fire-sprung |
| 89 | Bell | Mac Giolla Mhaoil | - |
| 90 | Scott | - | a Scottish gael |
| 91 | Hogan | ó hÓgáin | young |
| 92 | O'Keeffe | ó Caoimh | gentle |
| 93 | Magee | Mag Aoidh | fire |
| 94 | MacNamara | Mac Conmara | hound of the sea |
| 95 | MacDonald | Mac Dónaill | world-mighty |
| 96 | MacDermott | Mac Diarmada | free from jealousy |
| 97 | Molony | ó Maolomhnaigh | servant of the Church |
| 98 | O'Rourke | ó Ruairc | - |
| 99 | Buckley | ó Buachalla | cow herd |
| 100 | O'Dwyer | ó Dubhuir | black |
