the Isable Corkill could be w/o Don Corkill of Corna -
1671 lib vas re 10s rent in 20s Cardle - Wm Corkill being grandchild to ye sd Don Corkill & ye right falling due to him by course of descent is entered for ye same as next tenant according to ye custome of ye countrey
I havn't seen the will so can't comment on it - the Lib Vas entry corresponds to Corna begg still held by Wm Corkill in 1703 with Dan Corkill having compounded for it in 1643