It is descended from Old Englishwé, which was pronounced something like way in modern English. It is related to Germanwir, Dutchwij, Frisianwy, and Danishvi.
... line is a compound
of "mat" (me) and "stha" (standing, staying at) and
means "they are in me".
"-aham" (I) in the second line is nominative. na caaham =
"...and not ...