Sorry time to close the thread
Unless you really love it, I'd put Pamela in the middle spot :/
Alternatively, any name with Mel in it could honour a Pamela.
Emelda (bonus, includes an anagram of Adele) or Imelda
If Pamela means Honey, why not just use Honey to honor his mother?
As a longer alternative to Bibi, I like Bibiana. Miriam is also quite pretty, maybe Miriam Pamela Robinette?
I would put Pamela in the middle spot as well.
I would put Pamela or Honey in the middle spot (both to honor Pamela). Dorothy Honey R0binette...I love Dorothy. Love.