I am fairly sure they are separate families, at least for the last several centuries. In the US they were geographically separate. Generally speaking, before 1850 or so all the Rigbys were in New England, with some in PA and a handful in OH. The Rigsbys started in VA and moved south and west, never living in the north. The exceptions are one Rigsby family in MD and Washington DC, a Charles Rigby of early SC, and the Rigby family of AL who sometimes are found as Rigsby. Charles had a son William who lived in Colleton Co SC. That family also alternates between Rigby and Rigsby, but more commonly are seen as Rigby.
The Rigby and Rigsby families probably split way way back, like the 16th century or so. I haven't done a lot of research on either family in England, but my impression is that they live in different parts of the country there as well.
>Ephraim RIGBY m. 8 DEC 1823 in Dallas Co, AL to Susanna PARSONS.
Thank you very much for this. I agree, no doubt that is the E Rigby in Dallas Co in 1830 and Susan Rigsby there in 1840. That clears up my confusion with the Enoch of 1820. I'll add Ephraim's name to my census notes.
>Below are a handful of marriages I found in Lauderdale Co, MS
And thanks for those as well. I'll add them to my vitals records. I don't recognize any of them, but I would guess they are children or grandchildren of Bryant Rigby/Rigsby. Bryant shows up in Covington Co MS in 1820, moves to Kemper Co briefly, then to Lauderdale Co by 1840. I am pretty sure he is really Rigby, and could be related to Charles of SC.
>I almost feel silly posting this, since I probably should have checked the RIGBY forum
I hate to admit this, but I have looked at the Rigby forum only briefly. Based on what you found, it looks like I should spend some time there. Thanks very much for posting Thomas' will. That nicely ties together Enoch, Elijah, and Jesse, and also the Jane Rigby of Dallas Co. I will add a reference to it on my page for Enoch.
>Despite the evidence pointing towards these folks being RIGBYs, note that every one of them is listed as a RIGSBY.
I suspect it has something to do with the move to LA. The family may have decided that with their new life in a new state they would have a new name. One branch of my Hinds family changed their name to Hines when they moved to OR, and I have heard other stories of people changing their name when they move out west. There may be some hidden story that would explain why your branch moved away from the rest of the family, perhaps symbolically breaking all ties with them.
At any rate, it looks like Thomas + Jane are grandparents of your William. I was going to say I don't know anything about Thomas, but I just noticed I have him on the 1820 AL state census with Enoch:
Thomas Rigsby3 M >21, 2 M <21, 1 F >21, 1 F <21
He vanishes after that, which is consistent with his will of 1821 and Jane appearing on the 1830 census. I don't have any record of him before that, though.