Hi Shirley: I checked the link to one pedigree posted above.
Not sure if it is relevant as Sanders (Saunders) are rather common names.
When surnames were uniformly mandated in 1377 by parliament (poll tax of 1377) https://en.wikipedia.org/wiki/Poll_tax. Surnames were a province of the nobility. Commoners were referred to by their physical characterisitics, location or habitational, occupation or patronym.
Patronymic surnames appear in different forms according to the region in which they lived . Thus a predominantly Saxon area would be Sanderson, a Scandanavian area would be Sandersson, a Scottish or Welsh area would be Sanders (ex: Davis means son of David).
Apparently it is aNorwegian: habitational name from any of seven farmsteads so named in southeastern Norway, from the indefinite plural form of Old Norse sandr ‘sand’, ‘sandy plain’, https://www.ancestry.com/name-origin?surname=sander
The addition of the "s" (Sander(s)) could be Sanders(son).
Much the same has happened with the surname Tubb, over time in some lines and documents it is spelled Tubbs which could be the possessive sans apostrophe or plural.
A lot of English names are Scandanavian, especially Norse, in origin.
For instance the "by" at the end of a name, refers to a farmstead (which would grow into a village or town) such as Whitby or Gouldsby meaning the farmstead of Whit or Whid) andfarmstead of Gould.
