| Name | Location | Date | Member # |
| O'BRIEN | Garrison | Pre 1900 | B1689 |
| O'FLANAGAN | Garrison, Co Fermanagh | Pre 1800 | B1721 |
| O'HARE | Down | Pre 1900 | B1906 |
| O'HARE | Newry & South Down | 1860's | B1753 |
| OLIVER | Any | Any | A2695 |
| OLIVER | Co Monaghan | Pre 1800 | A2695 |
| OLIVER | Dna Groups | 1800+ | A2695 |
| OLIVER | Drumkeeran, Templecarn, Fermanagh | 1800-1900 | B1768 |
| OLIVER | Ireland & N Ireland | 1750+ | A2695 |
| OLIVER | Jedburgh, Scotland | 1500-1750 | A2695 |
| OLIVER | Nth America | 1800+ | A2695 |
| O'MULLAN | Glenullin/Garvagh | Pre 1900 | B1895 |
| O'NEILL | Newry & South Down | 1810-20 | B1753 |
| O'REILLY | Kilnaleck, Cavan | Pre 1870 | B1723 |
| ORR | Cappagh, Mountjoy | Pre 1900 | B0918 |
| ORR | Clough | 1750-1900 | B1626 |
| ORR | Cloughmills | 1750-1900 | B1626 |
| ORR | Coleraine | 1750-1900 | B1626 |
| ORR | Dungannon | 1910-25 | A2696 |
| ORR | Glastry, Co Down | Pre 1900 | A2732 |
| ORR | Lisbellaw, Tempo | Pre 1900 | B1692 |
| ORR | Tullygarley | 1730-2007 | B1626 |
| PARKER | Gilford | 1880 | B1673 |
| PARKER | Springfield, Enniskillen | 1750-1900 | B1770 |
| PARKINSON | Maguiresbridge | Pre 1950 | B1686 |
| PATRICK | Ballymoney | 1600-1903 | B1763 |
| PATTISON | Cavanagh, Cavan | Pre 1900 | B1709 |
| PAUL | Scotland | Pre 1865 | B0832 |
| PAUL | Gortamney, Tobermore | Any | B0833 |
| PEACOCK | North Antrim | 1800-1850 | B1615 |
| PEEL | Anywhere | Pre 1850 | A2701 |
| PIERCE | Belfast | any | B1849 |
| PLUNKETT | Springfield, Enniskillen | 1750-1900 | B1770 |
| POLLOCK | Albertbridge area, Belfast | Pre 1940 | A1819 |
| PORTER | Calmore, Tobermore | Pre 1940 | B0832 |
| PORTER | Co Londonderry | 1750-1850 | A2716 |
| PORTER | Inch Island, Co Donegal | Pre 1900 | A2762 |
| PRESTON | Armagh, Kilmore | Pre 1900 | A2890 |
| PRICE | Down or antrim | Pre 1861 | A2606 |
| PRITCHARD | Greyabbey | 1800+ | B0069 |
| PRITCHARD | Greyabbey | 1800+ | B0631 |
| PURDAY | Magherafelt area | Pre 1900 | B0832 |
| PURDY | Ballymulderg, Magherafelt | Any | B0833 |
| QUIGLEY | Aghaboy, Monaghan | Pre 1870 | B1723 |
| QUIN | Co Down | Pre 1860 | A2701 |
| QUINN | Dunboe & Magilligan | 1860-1900's | A1335 |
| QUINN | Carginagh, Kilkeel | Pre 1830 | B1760 |
| QUINN | Co Down | Pre 1860 | A2701 |
| QUINN | Ireland | Pre 1857 | A2606 |
| RABY | Greyabbey | 1800+ | B0069 |
| RAINBIRD | Belleek/Fermanagh | 1800's | B1674 |
| RAINEY | Antrim town | Mid 1800's | B1697 |
| RAINEY | Benagh, Newry | 1700+ | A0595 |
| RAINEY | Glenavy, Co Antrim | Mid 1800's | B1697 |
| RANKIN | Ballindrum, Co Tyrone | 1837+ | B0771 |
| REA | Boardmills/Belfast | 1700-1918 | A2797 |
| REID | Tyronel | Pre 1850 | A2792 |
| RICE | Kerry | Any | B1050 |
| RICE | Kilgarvan, Co Kerry | 1700-1910 | B1050 |
| RICHARDSON | Moree House, Tyrone | Before 6.6.1744 | B0918 |
| RICHARDSON | Portadown | Pre 1900 | A2735 |
| RICHARDSON | Tullyreavy, Tyrone | Before 1800 | B0918 |
| RICHEY | Moneymore | 1800's | B1451 |
| RICHIE/RITCHIE | Ballyeglish, Moneymore, Londonderry | any | A1552 |
| RIDDELL | Armagh, Kilmore | Pre 1900 | A2890 |
| ROBERTS | Ireland | Pre 1849 | A2606 |
| ROBINSON | Antrim | 1800-1850 | A2645 |
| ROBINSON | Racavan | 1860-1900 | A2645 |
| ROCK | Cloughmills/Ballymena | Pre 1850 | B1621 |
| RODDY | Co Louth | Pre 1900 | B1403 |
| ROGERS | Enniskillen, Fermanagh | Pre 1870 | B1716 |
| ROONEY | Clones Parish | Pre 1950 | B1778 |
| ROSS | Tipperary | Any | B1758 |
| RUDDELL | Laurelvale | Any | B0798 |
| RUSHE | Co Armagh | Pre 1900 | B1403 |
| RUSSELL | Ballylough, Co Down | About 1849 | B1796 |
| RUSSELL | Clough, Castlewellan area | Any | B1796 |
| RUTLEDGE | Omagh, Co Tyrone | pre 1910 | A2679 |
| SAVAGE | 9 Clanchattan st, Belfast | Pre 1930 | A1819 |
| SAVAGE | Dundrod area, Co Antrim | Circa 1950's | A1819 |
| SAVAGE | Tewkesbury Tce, Belfast | 1920's | A1819 |
| SCULLY, MARTIN | Co Down | 1845-1870 | A2596 |
| SCULLY, PATRICK | Co Down or Derry | 1820-1880 | A2596 |
| SHANNON | Rasharkin | pre 1875 | B1944 |
| SHAW, JOHN | N Ireland ? | Born 1839 | A2686 |
| SHAW, MARY | N Ireland ? | Born 1850 | A2686 |
| SHAW, ROBERT | N Ireland ? | Born 1841 | A2686 |
| SHAW, SAMUEL | N Ireland ? | Pre 1900 | A2686 |
| SHAW | Larne/Cairncastle/Raloo | 1800-1900 | B1381 |
| SHAW | Strabane | Pre 1900 | B1317 |
| SHEEKY | Seapatrick, Co Down | Pre 1850 | A1160 |
| SHEPPERD | Bangor | Pre 1900 | A2608 |
| SHERLOCK | Co Sligo | 1820's | A1160 |
| SHOOTER/SUITER | Coalisland | Pre 1950 | B1709 |
| SHORT | Bann Valley | pre 1880 | B1625 |
| SIBBETT | Northern Ireland | Any | B0396 |
| SIMPSON | Co Down | 1800-1860 | A0359 |
| SINCLAIR | Belfast | 1800-1945 | A2750 |
| SINCLAIR, DANIEL | Dunluce Parish | About 1800 | B1618 |
| SINCLAIR, FINLAY | Dunluce Parish | After 1785 | B1618 |
| SINCLAIR, JOHN | Dunluce Parish | About 1800 | B1618 |
| SINCLAIR, PATRICK | Dunluce Parish | After 1796 | B1618 |
| SINCLAIR, WILLIAM | Dunluce Parish | About 1800 | B1618 |
| SLEITH | Newry | 1800-80 | B1904 |
| SMALL | Kirkmoyle/Kirkhills | Pre 1900 | B1619 |
| SMITH | Any | Any | B1796 |
| SMITH | Belfast | About 1884 | B1796 |
| SMITH | Moneydorraghmore, Annalong | Pre 1870 | B1760 |
| SMITH | Sligo town | 1600-now | A2676 |
| SMULLEM | Tyrone & Donegal | Pre 1900 | B1317 |
| SMYTH | Belfast | Pre 1900 | A2611 |
| SMYTH | Down/Newry | Pre 1900 | B1756 |
| SMYTH | South Coleraine | 1800-1900 | A0756 |
| SMYTH | South Coleraine | 1800-1900 | A0756 |
| SPENCE | Devenish, Fermanagh | 1700-1800's | B1804 |
| SPROULE | Drumquin area, Co Tyrone | 1700-1900 | A2650 |
| STAPLES | Lissan, Cookstown | Pre 1900 | B0918 |
| STARS | Omagh district | Pre 1900 | B1845 |
| STEPHENS | Oulart, Wexford | Pre 1847 | A2606 |
| STEVENSON | Ballymena/Ballymoney | Pre 1800 | B1751 |
| STEVENSON | Strabane | 1750-1850 | A0595 |
| STEWART | Co Armagh | Pre 1800 | B0832 |
| STEWART | Magherafelt area | Any | B0832 |
| STEWART | Derryloran, Cookstown | Pre 1930 | B0833 |
| STEWART | Ballymena | 1860 | B1622 |
| STEWART | Lissan, Cookstown | Any | B0832 |
| STEWART | Tullough, Cookstown | Pre 1910 | B0832 |
| STINSON | Boho/Devenish | Pre 1900 | B1819 |
| STINSON | Donegal | Pre 1850 | A2792 |
| STOCKMAN | Tobermore, Co Londonderry | Any | B0832 |
| STRAIN | Tartaraghan, Co Armagh | Pre 1900 | B1674 |
| STURGEON | Gilford | 1880 | B1673 |
| SWIFT | Co Tyrone | Any | A2647 |
| SWINDLE | Gortacharn | 1750-1800 | B1772 |
| TAGGART | Racavan | 1830-1900 | A2645 |
| TARLETON | Geasehill, Offaly | Pre 1800 | B0918 |
| TARLETON | Geasehill, Offaly | Pre 1850 | B0918 |
| TAYLOR | Newtownards | 1918+ | A2757 |
| TAYLOR | Sligo | 1600-1900 | A2676 |
| THOBURN | Templepatrick | Pre 1800 | B1751 |
| THOMPSON | Armagh or Tyrone | Any | A0493 |
| THOMPSON | Co Down | 1700-1900 | A1995 |
| THOMPSON | Londonderry | Pre 1850 | A2682 |
| THOMSON | Londonderry | Pre 1850 | A2682 |
| TIMMONY | Any | Pre 1839 | A2607 |
| TIMONEY | Any | Pre 1839 | A2607 |
| TODD | Corlea, Omagh | Pre 1850 | B1433 |
| TODD | Belfast | 1800-1945 | A2750 |
| TODD | Londonderry | Pre 1850 | A2682 |
| TODD | Tyrone | Pre 1880 | B1716 |
| TOOMER | Ireland | Pre 1857 | A2606 |
| TRIMBLE | Shiroe, Longford | Pre 1845 | B0918 |
| TUBMAN | Enniskillen | Pre 1900 | B1816 |
| TURK | Annaloist & Turmoyra, Lurgan | Any | B1459 |
| TURKINGTON | Annaloist & Turmoyra, Lurgan | Any | B1459 |
| TUTON/TEUTON | | Pre 1900 | A2611 |
| VAUGHAN | Co Donegal | 1900+ | B0699 |
| VINT | North Down | 1800-1850's | B1849 |
| WAIDE | Clough | pre 1875 | B1944 |
| WALKER | Coleraine | Pre 1850 | B1762 |
| WALKER | Greyabbey | 1800+ | B0069 |
| WALLACE | Armagh | 1790-1850 | A2803 |
| WALLACE | Killyleagh | pre 1840 | A2813 |
| WALLACE | Belfast | Pre 1920 | B1760 |
| WALLACE | Markethill, Co Armagh | 1750-now | A2339 |
| WALSH | Colone | 1800-80 | B1904 |
| WARK | Belleek/Fermanagh/Donegal | 1800-1900 | B1674 |
| WARKE | Londonderry | 1800 | B1473 |
| WARNOCK | Gortin/Newtownstewart | Pre 1900 | B1317 |
| WARNOCK | Portavogie, Co Down | 1700-1900 | B1770 |
| WARNOCK | Tyrone | Pre 1900 | B1317 |
| WATERS, PATRICK | Dublin | Pre 1874 | B1756 |
| WATERS | Wexford & Dublin | Pre 1900 | B1756 |
| WATTERSON | Co Fermanagh | Pre 1900 | B0833 |
| WATTERSON | Cookstown | Any | B0832 |
| WEIR | Caledon/Dungannon | 1850-1900 | B1451 |
| WEIR | Tyrone | 1800's | B1451 |
| WHITE | Tyrone/Belfast | Pre 1900 | A2797 |
| WHITE | Ballinderry | pre 1850 | A2813 |
| WHITE | Co Fermanagh | Pre 1900 | B0699 |
| WHITE | Lisnacree, Kilkeel | Pre 1860 | B1760 |
| WHITTAKER | Co Donegal | 1900+ | B0699 |
| WHITWORTH | SE London | Any | B1627 |
| WILEY | Armagh | 1800's | A2673 |
| WILEY | Lisbellaw | Pre 1900 | B1692 |
| WILKIE, Isobella | Co Down | c. 1828 | A2702 |
| WILKIE, John | Co Down | c. 1829 | A2702 |
| WILKINSON | Moneymore, Co Londonderry | Any | B0832 |
| WILLIAMS | Co Kerry, Ireland | 1700-1910 | B1050 |
| WILLIAMS | Kerry/Cavan/any | 1700-1920 | B1050 |
| WILLIAMSON Nee GLASS | South Coleraine | 1800-1900 | A0756 |
| WILLIAMSON nee GLASS | South Coleraine | 1800-1900 | A0756 |
| WILLIAMSON | Cumberland | 1500-1950 | A1995 |
| WILLIAMSON | Moneymore, Cookstown | Any | B0832 |
| WILLIAMSON | South Coleraine | 1800-1900 | A0756 |
| WILLIAMSON | South Coleraine | 1800-1900 | A0756 |
| WILSON | Belfast / Monaghan | pre 1865 | A2813 |
| WILSON, RACHEL | Kilcranny, Coleraine | before 1824 | B1642 |
| WILSON | Brackney, Kilkeel | Pre 1900 | B1760 |
| WILSON | Fermanagh | 1800-1850 | A2645 |
| WILSON | Maghadone, Moneymore, Londonderry | any | A1552 |
| WILSON | Newtownbutler | Pre 1860 | B1723 |
| WOODS | Maytone, Glenanne, Armagh | 1800-1950 | B0771 |
| WOODS | Newry | Any | B1757 |
| WRIE | Letterbreen, Fermanagh | Pre 1900 | B1716 |
| WYLIE/WILEY | Nth. Antrim | Pre 1900 | B1619 |
| WYLIE | Rasharkin | pre 1875 | B1944 |
| WYLIE | Cumberland | 1700-1900 | A1995 |
| WYLIE | Lisbellaw | Pre 1900 | B1692 |
| WYLIE | Oceanic St, Belfast | Early 1900's | B1692 |
| YOUNG | Ballymoney | Pre 1900 | B1619 |
| YOUNG | Co Down | Pre 1900 | B1403 |
