Cornwall Families

I have been doing pre-1850 CHEGWIDDEN & COATH (Cornwall& N.Z.) research for years, now branching out to find names CHENOWETH/CHYNOWETH (who seem to figure a lot in the old criminal records), LOWER, SYMON(S)/SIMON(S). One of these families is supposed to have been Huguenot, but I have not found anything to confirm this, although SIMON is one of the names listed on a Huguenot site.