I think it’s okay to have similar names on your list that wouldn’t work as sibs 
It’s unlikely you’ll have 27 kids right?
I’d consider adding…
[name_f]Agatha[/name_f] (Aggie, [name_f]Athie[/name_f], Hattie)
[name_f]Bridget[/name_f] (Bree, Birdie)
[name_f]Alberta[/name_f] (Alba, Bertie)
[name_f]Clementine[/name_f] (Clemmie, Cece)
[name_f]Martha[/name_f] (Mari, [name_f]Martie[/name_f], Mattie)
[name_f]Apolline[/name_f] (Polly, [name_f]Allie[/name_f], Poppy)
[name_f]Paulina[/name_f] (Polly, Lina)
[name_f]Thomasin[/name_f] / Thomasina/ [name_f]Tamsin[/name_f] (Tansy, [name_m]Tommie[/name_m], [name_f]Maisy[/name_f], Mina)
[name_f]Francesca[/name_f] (Frankie, Francie)