Well, since you haven't recv'd any follow up, I will share my very unveried understanding of the Slayton clan.
There seems to be 3 or 4 branches.
The "Northern" or "Cabin Boy" Branch, the southern branch, the branch that spells the name wrong, and the Black/Afro-American Branch.
The "Cabin Boy" branch is my branch, and so named because the first Slayton was an indentured cabin boy from the Tweed River Valley of Scotland (Some say N. England) who arrived in Boston around 1700.
The Southern branch I have little knowledge of, other than to know it exists.From my little reading, I suspect it comes from different roots than the Cabin Boy branch, but I am not sure.
There is a bunch of Slatons, Slattens, Sladens, and so forth that may or may not be related.I know that family lore has it that one of the early Slaytons in the cabin boy branch made it part of his will that the "Y" was supposed to always stay in the name.
The Black Branch, again from my casual reading, seems to have originated in the Georgia area.
Again, all this info should NOT be considered as fact.