I suggested
Marjorie during my first pregnancy, and DH said "She'd be born ready middle-aged". I still like the sound, but maybe it's a name that needs to wait in the wings for a while longer.
I like
Marjorie and
Frances together, and actually know a sibset with those names! There's a third sister,
Christine.
I can't warm up to
Fern, I'm afraid, and it's too fizzy and frothy and ef-y with
Frances. Try
Marjorie Fern and
Frances Someonelse:
Frances Angela as a combo has the same retro feel as
Marjorie.