Firstly congratulations on your twin girls 
I love the idea of [name_f]Josephine[/name_f] & [name_f]Emmeline[/name_f] that’s a great suggestion from @cactusgram
Other suggestions (count repeats as seconds)
Angeline ~ [name_f]Josephine[/name_f] & [name_f]Angeline[/name_f] ‘[name_u]Angie[/name_u]’
[name_f]Evangeline[/name_f] ~ [name_f]Josephine[/name_f] & [name_f]Evangeline[/name_f] ‘[name_f]Evie[/name_f]’
[name_f]Adeline[/name_f] ~ [name_f]Josephine[/name_f] & [name_f]Adeline[/name_f] ‘[name_f]Addie[/name_f]’
[name_f]Delphine[/name_f] ~ [name_f]Josephine[/name_f] & [name_f]Delphine[/name_f] ‘[name_f]Delphi[/name_f]’
[name_f]Clementine[/name_f] ~ [name_f]Josephine[/name_f] & [name_f]Clementine[/name_f] ‘[name_u]Clem[/name_u]’
[name_f]Alexandrine[/name_f] ~ [name_f]Josephine[/name_f] & [name_f]Alexandrine[/name_f] ‘[name_u]Lexi[/name_u]’
[name_f]Hermine[/name_f] ~ [name_f]Josephine[/name_f] & [name_f]Hermine[/name_f] ‘[name_f]Minnie[/name_f]’
[name_f]Ottoline[/name_f] ~ [name_f]Josephine[/name_f] & [name_f]Ottoline[/name_f] ‘Otti’
[name_f]Rosaline[/name_f] ~ [name_f]Josephine[/name_f] & [name_f]Rosaline[/name_f] ‘[name_f]Rosie[/name_f]’
[name_f]Coraline[/name_f] ~ [name_f]Josephine[/name_f] & [name_f]Coraline[/name_f] ‘[name_f]Cora[/name_f]’
[name_f]Evaline[/name_f] ~ [name_f]Josephine[/name_f] & [name_f]Evaline[/name_f] ‘[name_f]Evie[/name_f]’
[name_u]Valentine[/name_u] ~ [name_f]Josephine[/name_f] & [name_u]Valentine[/name_u] ‘[name_u]Vale[/name_u]’
Hope this helped