Lorelei and Vera are our top picks, as well. Vera is his paternal g-ma's name, and she passed away back in the '20s or '30s. There are no pictures of her or anything so we thought it would be a nice tribute to her. His mom's name was Veronica, but she hated it because people shortened it to Ronnie and that bothered her until the day she died. I thought Vera was close enough to Veronica also. Lorelei is actually from a German story that I always liked and I have fond memories of visit the Lorelei statue in Germany.
So I guess our names are tentatively
Merrick Phillip Beckett for a boy (Merrick for his sister Mary, and Beckett for his late sister Rebecca)
Lorelei or Vera Rebecca Mary for a girl.