He could possibly be the William William in this household on the 1841 census but no occupation is given so not particularly likely. The place of residence is about right though.
Maesmaer, Talybont, Llanthetty, Breconshire
Phillip ????? 60 Farmer Y
Sarah Do 60 Y
Thos Do 25 Y
Rachel Do 20 Y
Jane Do 15 Y
-
Willm Willm 70 Y
James Jones 5 Y
-
Cazan(?) Prichard 50 (female column) M S Y
Elizabeth Price 25 Y
???? Jones 20 (female) Y
John Jones 25 Y
David Morgan 20 Y
William Lewis 15 Y
John Do 12 Y
1841 census on Ancestry