I'm having real trouble with this line -- the Overview to this profile states that the line is unproven, though it appears in a book.
I think it's not only unproven but impossible.
Thom the Saxon is supposedly the son of the comte de Nevers and his wife, and went to England with William the Conqueror.
The name Thomas did indeed go into England with the Normans, fair enough -- however, this abbreviation -- Thom -- did not exist. Also, if he came from Normandy, he wasn't a Saxon. Also, if he came from Nevers, he wasn't a Norman.
Then he has a child, Toen of Cornwall. Toen is a name that is found in various countries across the globe, but none of them are Saxon, Welsh, Cornish, Norman, or anything that this person could possibly be. Also, if Thom has suddenly become a Saxon (which he didn't, since he was supposedly from Normandy, which he couldn't have been), why does he have a child in Cornwall? With some name that came from the Netherlands, or Norway, or maybe Cambodia?
The line goes down for a bit, but it is very problematic indeed.
If there is some actual real evidence of these people, then yay!
But they will not be having these names.
And mostly likely they weren't there.