| Family Name | Source of Relationship |
|---|---|
| Sandy | Parents of William J. Duffy, Jr.'s 1st wife, Mary Elizabeth Sandy. |
| Schickling | Probably related to me through the Patrick and Mary (nee McKenna) McCabe family that I found. |
| Schmider | Related through my paternal grandfather's 1st cousin James M. Morrissey's wife, Mary Agnes Schmider. |
| Schroyer | Probably related through DNA. I assume the connection is through my Morrissey family. |
| Sheehy | Related descendants of my great aunt and uncle Margaret (nee Murphy) and John McCabe. |
| Sheridan | A Co. Monaghan, Ireland Sheridan family related to me by marrying into a McNally family DNA match to me. |
| Sherry | Related to me through a Campbell descendant with a DNA match to me, Ed MacRodain, and Harry Hall. |
| Shirley | Related to me via at least one DNA connection. |
| Shortt | Related through "my" Hall family, which is related to "my" McCabe family, through DNA tests. |
| Simpson | Related through my Morrissey family. |
| Skeath | Related through DNA connections between me and two of my DNA cousins. |
| Smith | Related through descendants with DNA matches to me and to other members of my extended family. |
| Sorli | Related through two Sorli siblings, John and Marie, both with a DNA match to me. |
| Spillane | Related through marriage of Bridget Elizabeth Tierney, daughter of my great aunt Bridget (nee McCabe) Tierney. |
| Sprinkle | Related through my DNA link to the Edward and Rosa (nee McCabe) Downie family. |
| Stanton | Related by marriage through my great aunt Bridget (nee McCabe) Tierney. |
| Starkey | Related as Bridget (nee McCabe) Starkey is a descensant of Peter and Alley/Alice (nee Whearty) McCabe. |
| Sturgis | Related to me through varioue DNA connections including Ancestry.com userid johnnHagan13. |
| Sullivan | Related through my great aunt Bridget (nee McCabe) Tierney. |
| Sweeney | I believe I am related to two Sweeney families, with one of those connections being thru Harry Hall. |
| Swift | Related through my Geortler/Cannan family connections. |