Ahhh bless her!
So looking at the names they both like there appears to be a common sound of ‘son’ so Maybelle choosing a son name would work here are some suggestions
Hudson
Watson
Dawson
Benson
Lawson
Greyson
Samson
Wilson
Anderson
Jameson
Or maybe just Sonny? I think Sonny works really well with her other kiddos
The letter X also clearly appeals to mama so maybe the likes of Axel, Axis, Xavier, Xander, Rex, Jax, Maxwell, Maddox, Paxton, Phoenix, Nixon, Felix & Braxton.
Names with the R ending of Brewer, C@rter that may appeal could be Fletcher, Sawyer, Maverick, Thatcher, Miller, Asher, Jasper, Parker, Archer, Tyler, River & Hunter.
J names appeal to mama too so maybe Jonas, Joseph, Josiah, Jonah, Justus, Joshua, Judah & Julius could appeal.
Other ideas:
Maverick, Merrick, Merritt, Brody, Leo, Rafferty, Abel, Asa, Tobias, Beckett, Reuben, Caspian, Wilder & Flynn.
Hope this helps