G'day,
The versions of "Captain Wedderburn's Courtship" (Child #46) that I have all consistently say "Priest unborn". The solution to this riddle being that torn or cut from his mother's side, in one version by a wild boar.

e.g.
'Oh then', quo he, 'my young brother from mother's side was torn,
And he's a gentil English priest, of woman never born'

Cheers,
Alan