My interest in PEARSE has expanded somewhat since the original post, so I thought I'd post an update to include some of the latest additions/puzzles.
Currently trying to determine if the Mary PEARSE who married John OXENHAM in Stoke Damerel in 1835 is truly the dtr of Richard and Mary (HELSON) PEARSE of Walkhampton, Devon. John and Mary emigrated to Michigan c 1850.
Also trying to determine parentage of an Anthony PEARSE who married Elizabeth CREBER probably bef 1821 Walkhampton. Anthony was supposedly born c 1778 but I haven't managed to find his baptism yet (not in Walkhampton)
Likewise a Philip PEARSE marr. 1816 to Elizabeth KING in Walkhampton, born c 1791 somewhere in Devon.
And a Richard H PEARSE born Canada c 1849 who pops up in Michigan with a Grace who looks like she might just be his mother.Richard later marries Besty OXENHAM, dtr of the above John and Mary.