| Family Name | Source of Relationship |
|---|---|
| Tenanty | Related through descendant Sheila (nee Moore) McCoy, a documented 4th cousin to me. |
| Tepper | Related through my great, great grandparents Michael and Mary (nee Hewitt) Morrissey |
| Thackery | Related through a DNA between me and a Thackery family member. |
| Timlin | Related through my 2x great grandparents Michael and Mary (nee Hewitt) Morrissey's son Edward. |
| Tracey | Related through the family of my great aunt Mary (nee O'Brien) Murphy. |
| Trainor/Traynor | Related thru my 2x great grandmother, Catherine (nee Trainor) Kernan, and another Trainor family related thru DNA tests. |
| Tierney - Co. Cavan | Related through my DNA cousin Ed Mac Rodain's family. |
| Tierney - Co. Louth | Related through my great aunt Bridget McCabe, daughter of Peter and Bridget (nee Murphy) McCabe. |
| Tobin | David and Mary (Riordan) Tobin were/are a set of 3x great-grandparents of my DNA cousin Berry McCabe. |
| Toris - Co. Louth | Parents of my great-great-Aunt, Margaret (nee Toris) McCabe, wife of my great-great-Uncle, Henry McCabe. |
| Trapp | Related through a marriage to a granddaughter of my great, great grandparents, Michael and Mary (nee Hewitt) Morrissey |
| Travers | Related through my DNA match to Noreen (nee McNamara) Ruede, a Travers family descendant. |
| Tummon | Co. Monaghan, Ireland - Related thru my DNA link to Winifred (nee Brogan) Tummon's grandniece, Orla Brogan |
| Turtle | Related through connections to my great, great aunt and uncle Margaret (nee Murphy) and John McCabe |