Peter is my #1 name for a boy. Always has been and (knock wood) always will be. So I'm thrilled to see you considering it for a ds, even as a mn.
As for
Madeline, I'd prefer
Madeleine ("MAD-uh-lin") or
Magdalene, but
Madeline is equally nice.
If I recall my biblical controversies correctly, aren't there some who claim
Mary Magdalene (=
Madeline) was pushed out of influence by
Peter? Perhaps the two of them are continuing their struggle through you and your dh, via the "Encyclopedia of Saints' Names." :-P
Jacob Leonard and
Jacob Cosmas are nice. I'm just tired of
Jacob right now.