I like George and Lucy and Peter nn Pete and Lucy (Pete is often used as a slang word for a male body part). Mack makes me think of a huge truck so I would have something longer (Irish Cormac?). I like Maren but spelled with an "e" to avoid the place name connection (although Marin County is lovely). Ava is ok but megapopular so she may have to share her name throughout her school years. Do you like Eva? Peter and Eva would be an awesome pair.