| Family Name | Source of Relationship |
|---|---|
| Lafferty | My Aunt Betty Lou's maiden name |
| Lambe/Lamb | Catherine (nee McCabe) McCullough Lambe was/is related to McCabe Sorli descendants, and to Michie & her brothers. |
| Larkin | Several Larkin families related to me through DNA connections. |
| Lauer | Related through my Dennis Murphy Family |
| Lee | Related to me through various Lee and Campbell family DNA matches. |
| Lennon | There are at least two Lennon families related to me or members of my extended family. |
| Leutner | Related through my Dennis Murphy Family |
| Lock/Locke | Related through son of Margaret (nee Lock/Locke) McKenna marrying a Henry & Mary (nee Byrne) McCabe granddaughter. |
| Lynch | There are several Lynch families related to me, some thru marriage, some thru DNA testing. |
| Lyons | Related through Eugene Kernan, son of my great aunt and uncle Marie (nee Garvey) and John Kernan |
| Lysaght | Related by marriage through my great aunt Bridget (nee McCabe) Tierney |