I used your long lists to make some twin name combos. Maybe this’ll help you figure out what you like & narrow down your name lists a little 
[name]Dean[/name] [name]Clifford[/name], [name]Russell[/name] [name]Blaise[/name], [name]Paisley[/name] [name]Madison[/name], [name]Cheyenne[/name] [name]Mariah[/name], ______ & ______
[name]Logan[/name] [name]Amos[/name] & [name]Boone[/name] [name]Brooks[/name]
[name]Blake[/name] [name]Abram[/name] & [name]Emmett[/name] [name]Clive[/name]
[name]Dalton[/name] [name]Clive[/name] & [name]Callum[/name] [name]Blake[/name]
[name]Amos[/name] [name]Brooks[/name] & [name]Samuel[/name] [name]Boone[/name]
[name]Abram[/name] [name]Dakota[/name] & [name]Callum[/name] [name]Addison[/name]
[name]Emmett[/name] [name]Colt[/name] & [name]Samuel[/name] [name]Beau[/name]
[name]Addison[/name] [name]Blake[/name] & [name]Logan[/name] [name]Brooks[/name]
[name]Grayson[/name] [name]Beau[/name] & [name]Samuel[/name] [name]Riley[/name]
[name]Clive[/name] [name]Amos[/name] & [name]Blake[/name] [name]Addison[/name]
[name]Boone[/name] [name]Riley[/name] & [name]Clive[/name] [name]Brooks[/name]
[name]Blake[/name] [name]Callum[/name] & [name]Grayson[/name] [name]Colt[/name]
[name]Colt[/name] [name]Addison[/name] & [name]Beau[/name] [name]Dakota[/name]
[name]Riley[/name] [name]Callum[/name] & [name]Addison[/name] [name]Boone[/name]
[name]Beau[/name] [name]Brooks[/name] & [name]Colt[/name] [name]Blake[/name]
[name]Dakota[/name] [name]Clive[/name] & [name]Logan[/name] [name]Samuel[/name]
Shailene [name]Clara[/name] & [name]Delaney[/name] [name]Charlotte[/name]
[name]Georgia[/name] [name]Siena[/name] & Emylyn [name]Lacey[/name]
[name]Josie[/name] [name]Britton[/name] & [name]Clover[/name] Shailene
[name]Johanna[/name] [name]Cassidy[/name] & [name]Tabitha[/name] [name]Dixie[/name]
[name]Virginia[/name] [name]Delaney[/name] & [name]Annabelle[/name] [name]Scout[/name]
[name]Dolly[/name] [name]Charlotte[/name] & [name]Lila[/name] Shailene
[name]Jolene[/name] [name]Scout[/name] & [name]Cassidy[/name] [name]Blake[/name]
[name]Dixie[/name] [name]Annabelle[/name] & [name]Josie[/name] [name]Virginia[/name]
Emylyn [name]Clara[/name] & [name]Lacey[/name] Shailene
[name]Clara[/name] [name]Georgia[/name] & [name]Britton[/name] [name]Dixie[/name]
[name]Lila[/name] [name]Charlotte[/name] & [name]Josie[/name] [name]Tabitha[/name]
[name]Delaney[/name] Emylyn & [name]Virginia[/name] [name]Scout[/name]
[name]Britton[/name] [name]Annabelle[/name] & Shailene [name]Cassidy[/name]
[name]Josie[/name] Shailene & [name]Dolly[/name] [name]Siena[/name]
[name]Johanna[/name] [name]Dixie[/name] & [name]Charlotte[/name] [name]Dolly[/name]
[name]Boone[/name] [name]Callum[/name] & [name]Clover[/name] [name]Siena[/name]
[name]Addison[/name] [name]Beau[/name] & [name]Tabitha[/name] [name]Jolene[/name]
[name]Grayson[/name] [name]Brooks[/name] & [name]Dixie[/name] [name]Annabelle[/name]
[name]Abram[/name] [name]Clive[/name] & [name]Clara[/name] [name]Lacey[/name]
[name]Emmett[/name] [name]Logan[/name] & [name]Cassidy[/name] [name]Scout[/name]
[name]Samuel[/name] [name]Dalton[/name] & [name]Dolly[/name] [name]Johanna[/name]
[name]Dakota[/name] [name]Blake[/name] & [name]Annabelle[/name] [name]Clover[/name]
[name]Boone[/name] [name]Blake[/name] & [name]Lila[/name] Emylyn
[name]Clive[/name] [name]Abram[/name] & [name]Delaney[/name] [name]Jolene[/name]
Shailene [name]Dixie[/name] & [name]Logan[/name] [name]Riley[/name]
[name]Virginia[/name] [name]Annabelle[/name] & [name]Amos[/name] [name]Emmett[/name]
[name]Dolly[/name] [name]Clover[/name] & [name]Callum[/name] [name]Dakota[/name]
[name]Tabitha[/name] [name]Lacey[/name] & [name]Colt[/name] [name]Emmett[/name]
[name]Lila[/name] [name]Blake[/name] & [name]Logan[/name] [name]Dakota[/name]
[name]Dixie[/name] [name]Clara[/name] & [name]Riley[/name] [name]Boone[/name]
[name]Scout[/name] Emylyn & [name]Beau[/name] [name]Amos[/name]
I know you said that one or both girls would have a M middle name to match their sisters but I don’t know if those are picked out or if you needed suggestions? I paired names out of your list so you can maybe sort out which ones you [name]LOVE[/name] and which don’t feel right.
(Shot in the dark) Possible Girls “M” Middles List:
- [name]Mariah[/name] & [name]Madison[/name]-
[name]Macey[/name]/[name]Macy[/name]
[name]Maple[/name]
[name]Madge[/name]
[name]Marigold[/name]
[name]Mamie[/name]
[name]Meadow[/name]
[name]Majorie[/name]
[name]Micah[/name]
[name]Maia[/name]
[name]Molly[/name]
[name]Mabry[/name]
[name]Maeve[/name]
[name]Miriam[/name]
[name]Marley[/name]
[name]Mirabelle[/name]
[name]Magnolia[/name]
[name]Myla[/name]
[name]Marina[/name]
[name]Mare[/name]/[name]Maire[/name]
[name]Milan[/name]
[name]Maisie[/name]
[name]Miracle[/name]
[name]Meredith[/name]
[name]Mandie[/name]
[name]Margo[/name]/[name]Margot[/name]
[name]Mina[/name]
[name]Makenna[/name]
[name]Michaela[/name]/[name]Mikaela[/name]
[name]Makayla[/name]
[name]Megan[/name]
[name]Marissa[/name]
[name]Maleah[/name]/[name]Maliah[/name]/[name]Maliyah[/name]
[name]Mae[/name]
[name]Marianna[/name]
[name]Maggie[/name]
[name]Mable[/name]
Are any of these in the right direction?
Refrence List:
G - [name]Delaney[/name], Shailene, [name]Britton[/name], [name]Annabelle[/name]/[name]Belle[/name]/[name]Annie[/name], [name]Clara[/name], [name]Charlotte[/name], [name]Johanna[/name], [name]Tabitha[/name], [name]Siena[/name], [name]Josie[/name], [name]Cassidy[/name], [name]Virginia[/name], [name]Georgia[/name], [name]Dolly[/name], [name]Dixie[/name], [name]Lacey[/name], Emylyn, [name]Jolene[/name], [name]Clover[/name], [name]Scout[/name], and [name]Lila[/name].
B - [name]Boone[/name], [name]Blake[/name], [name]Callum[/name], [name]Addison[/name], [name]Emmett[/name], [name]Abram[/name], [name]Logan[/name], [name]Dalton[/name], [name]Dakota[/name], [name]Riley[/name], [name]Samuel[/name], [name]Colt[/name], [name]Grayson[/name], [name]Beau[/name], [name]Brooks[/name], [name]Clive[/name], and [name]Amos[/name]
Congrats again & good luck!