Variant spellings are included, so there may be some duplication. If you know of something that should be included, please let me know
| Haden |
| Hafey Donegal, New York |
| Haffey Donegal, New York |
| Haffy Donegal, New York |
| Hagarty |
| Hagerty |
| Haggarty |
| Haggerty |
| Halahan (archived) |
| Hall |
| Hall (archived) |
| Hallaghan (archived) |
| Hallahan (archived) |
| Hallahane (archived) |
| Hallaran |
| Halleran |
| Hallihan (archived) |
| Hallihane (archived) |
| Halloran |
| Halloren |
| Haloran |
| Hamel (archived) |
| Hamell (archived) |
| Hamil (archived) |
| Hamill (archived) |
| Hammell (archived) |
| Hammil (archived) |
| Hammill (archived) |
| Hanan |
| Handley |
| Handley Moycullen Co. Galway, Boston |
| Handley Solohead area, Co. Tipperary |
| Handly |
| Handly Moycullen Co. Galway, Boston |
| Handly Solohead area, Co. Tipperary |
| Handratty Germany |
| Haneen |
| Hanely |
| Hanely Moycullen Co. Galway, Boston |
| Hanely Solohead area, Co. Tipperary |
| Hanen |
| Hangley |
| Hangley Moycullen Co. Galway, Boston |
| Hangley Solohead area, Co. Tipperary |
| Hangly |
| Hangly Moycullen Co. Galway, Boston |
| Hangly Solohead area, Co. Tipperary |
| Hanheen |
| Hanlan |
| Hanlan Redmond O'Hanlon |
| Hanlen |
| Hanlen Redmond O'Hanlon |
| Hanley |
| Hanley Moycullen Co. Galway, Boston |
| Hanley Solohead area, Co. Tipperary |
| Hanlin |
| Hanlin Redmond O'Hanlon |
| Hanlon |
| Hanlon Redmond O'Hanlon |
| Hanly |
| Hanly Moycullen Co. Galway, Boston |
| Hanly Solohead area, Co. Tipperary |
| Hannahan |
| Hannan |
| Hanneen |
| Hannelly |
| Hannelly Moycullen Co. Galway, Boston |
| Hannelly Solohead area, Co. Tipperary |
| Hannin |
| Hanning |
| Hannon |
| Hanon |
| Hanratty Germany |
| Hara |
| Hara Cootehall area, Co. Roscommon |
| Haragan |
| Harborne |
| Harbourne |
| Harigan |
| Harogan |
| Harragan |
| Harraghy |
| Harragon |
| Harrahy |
| Harrigan |
| Harrigans |
| Harrihy |
| Harrougho |
| Hasset Tipperary/ Australia |
| Hassett Tipperary/ Australia |
| Hassey Tipperary/ Australia |
| Hassit Tipperary/ Australia |
| Hassitt Tipperary/ Australia |
| Haugh |
| Haw |
| Hawe |
| Hawes |
| Hawthorn Co. Down |
| Hawthorne Co. Down |
| Hayden |
| Haydn |
| Haydon |
| Hayes West Cork |
| Hays West Cork |
| Hayton |
| Headen |
| Headon |
| Heagarty |
| Heagerty |
| Healey |
| Healey |
| Heally |
| Heally |
| Healy |
| Healy |
| Heely |
| Heely |
| Heffernan |
| Heffernon |
| Hegarty |
| Hegerty |
| Heggarty |
| Helan |
| Helan Coolbanagher, Co. Laois |
| Helan Kilbehenny, Co. Cork (archived) |
| Helan |
| Heland |
| Heland Coolbanagher, Co. Laois |
| Heland Kilbehenny, Co. Cork (archived) |
| Heland |
| Heley |
| Heley |
| Hely |
| Hely |
| Hempenstall |
| Henagan |
| Henaghan |
| Henahan |
| Henakan |
| Henaughan |
| Heneberry |
| Henebery |
| Henebry |
| Henegan |
| Heneghan |
| Henehan |
| Henican |
| Henigan |
| Henihan |
| Henneberry |
| Hennebery |
| Hennebry |
| Hennegan |
| Hennigan |
| Henshaw |
| Hepenstal |
| Hepenstall |
| Heppenstall |
| Herley (archived) |
| Hernan Donegal |
| Hernon Donegal |
| Heyden |
| Heydon |
| Heyes West Cork |
| Hickson Kerry |
| Higgans |
| Higgans |
| Higgins |
| Higgins |
| Hill Derry/Londonderry |
| Hillan |
| Hillan Coolbanagher, Co. Laois |
| Hillan Kilbehenny, Co. Cork (archived) |
| Hillan |
| Hilland |
| Hilland Coolbanagher, Co. Laois |
| Hilland Kilbehenny, Co. Cork (archived) |
| Hilland |
| Hindes |
| Hindes |
| Hinds |
| Hinds |
| Hine |
| Hine |
| Hines |
| Hines |
| Hinshaw |
| Hodgson Kilbaha, Moyvane (Newtownsandes), Co. Kerry |
| Hodson Kilbaha, Moyvane (Newtownsandes), Co. Kerry |
| Hoey Mayo/Pennsylvania |
| Hoffman |
| Hogan Clare |
| Hogan Clare/Australia |
| Hogan |
| Hogh |
| Hollaran |
| Holley |
| Holloran |
| Holly |
| Holmes Kildare |
| Holmes Laois |
| Holms Kildare |
| Holms Laois |
| Holoran |
| Holy |
| Homes Kildare |
| Homes Laois |
| Hooley |
| Hooly |
| Horohoe |
| Hough |
| Hoy |
| Hoye |
| Hoyne |
| Hoynes |
| Hudson Kilbaha, Moyvane (Newtownsandes), Co. Kerry |
| Hunt Co. Sligo |
| Hurley (archived) |
| Hurly (archived) |
| Hussey Dingle area, Co. Kerry; and London |
| Hussey |
| Hussy Dingle area, Co. Kerry; and London |
| Hussy |
| Hutchenson |
| Hutcheson |
| Hutchinson |
| Hutchison |
| Hylan |
| Hylan Coolbanagher, Co. Laois |
| Hylan Kilbehenny, Co. Cork (archived) |
| Hylan |
| Hyland |
| Hyland Coolbanagher, Co. Laois |
| Hyland Kilbehenny, Co. Cork (archived) |
| Hyland |
| Hylands |
| Hylands Coolbanagher, Co. Laois |
| Hylands Kilbehenny, Co. Cork (archived) |
| Hylands |
| Hynan (archived) |
| Hynd |
| Hynd |
| Hyndes |
| Hyndes |
| Hynds |
| Hynds |
| Hynes |
| Hynes |