Variant spellings are included, so there may be some duplication. If you know of something that should be included, please let me know
| Kaar Tyrone |
| Kaar |
| Kain (archived) |
| Kain New Zealand (archived) |
| Kain N.W. Pennsylvania (archived) |
| Kaine (archived) |
| Kaine New Zealand (archived) |
| Kaine N.W. Pennsylvania (archived) |
| Kalaher |
| Kandrew |
| Kane (archived) |
| Kane New Zealand (archived) |
| Kane N.W. Pennsylvania (archived) |
| Karney Co. Cavan |
| Karney |
| Karney Michigan |
| Karr Tyrone |
| Karr |
| Kasson |
| Kasson Antrim/ New Zealand |
| Kavanagh (archived) |
| Kavanagh |
| Kavanaugh (archived) |
| Kavanaugh |
| Kavenagh (archived) |
| Kavenagh |
| Kayes |
| Kayne (archived) |
| Kayne New Zealand (archived) |
| Kayne N.W. Pennsylvania (archived) |
| Kays |
| Kealaher |
| Kealeher |
| Kean |
| Kean |
| Kean |
| Kean |
| Keane |
| Keane |
| Keane |
| Keane |
| Kearan Tyrone |
| Kearin Tyrone |
| Kearney Co. Cavan |
| Kearney |
| Kearney Michigan |
| Kearny Co. Cavan |
| Kearny |
| Kearny Michigan |
| Keating Wexford |
| Keatinge Wexford |
| Keatings Wexford |
| Keayes |
| Keays |
| Kee Donegal |
| Kee |
| Keefe |
| Keefe |
| Keeffe |
| Keeffe |
| Keelaghar |
| Keelagher |
| Keelaher |
| Keelan |
| Keeland |
| Keeliher |
| Keelin |
| Keeling |
| Keen |
| Keen |
| Keen |
| Keen |
| Keene |
| Keene |
| Keene |
| Keene |
| Kehoe Wexford/ Australia |
| Keiffe |
| Keiffe |
| Keiliher |
| Keirnahan |
| Kelagher |
| Kelaher |
| Kelcher |
| Kelecher |
| Kelegher |
| Keleher |
| Keliher |
| Kellagher |
| Kellaher |
| Kellegher |
| Kelleher |
| Kelley |
| Kelley |
| Kelley (archived) |
| Kelley (archived) |
| Kelley Kilkenny (archived) |
| Kelley Tipperary |
| Kelley |
| Kelley Southern U.S. states |
| Kelley |
| Kellie |
| Kellie |
| Kellie (archived) |
| Kellie (archived) |
| Kellie Kilkenny (archived) |
| Kellie Tipperary |
| Kellie |
| Kellie Southern U.S. states |
| Kellie |
| Kelliher |
| Kelly |
| Kelly |
| Kelly (archived) |
| Kelly (archived) |
| Kelly Kilkenny (archived) |
| Kelly Tipperary |
| Kelly |
| Kelly Southern U.S. states |
| Kelly |
| Kenedy |
| Kenna (archived) |
| Kennedy |
| Kenney Tipperary to Ontario |
| Kenny Tipperary to Ontario |
| Keogh Wexford/ Australia |
| Keough Wexford/ Australia |
| Ker Tyrone |
| Ker |
| Keragan |
| Kerican |
| Kerigan |
| Kernaghan |
| Kernahan |
| Kerney Co. Cavan |
| Kerney |
| Kerney Michigan |
| Kernihan |
| Kernohan |
| Kerr Tyrone |
| Kerr |
| Kerrican |
| Kerrigan |
| Kerwan Galway and Maryland |
| Kerwin Galway and Maryland |
| Key Donegal |
| Key |
| Key |
| Keye Donegal |
| Keye |
| Keye |
| Keyes Donegal |
| Keyes |
| Keyes |
| Keys |
| Kilalea |
| Kilaley |
| Killalea |
| Killally |
| Killelea |
| Killilea |
| Kincade Co. Down |
| Kincaid Co. Down |
| Kincaide Co. Down |
| Kincella (archived) |
| Kincella |
| Kinchela (archived) |
| Kinchela |
| Kinchella (archived) |
| Kinchella |
| King Tuam (archived) |
| Kinkead Co. Down |
| Kinnedy |
| Kinnsella (archived) |
| Kinnsella |
| Kinsella (archived) |
| Kinsella |
| Kinshela (archived) |
| Kinshela |
| Kinshella (archived) |
| Kinshella |
| Kirkpatrick |
| Kirpatrick |
| Kirwan Galway and Maryland |
| Kirwin Galway and Maryland |
| Kissane |
| Knee |
| Knowles |
| Krine |