A few options - count any repeats as seconds!
[name_f]Jemima[/name_f] (Jem, Mia, Mimi)
[name_f]Belphoebe[/name_f] (Bel, Fi, Bebe)
[name_f]Perdita[/name_f] (Perdie, Dita)
[name_u]Endellion[/name_u] (Nell, Dell, Leonie)
[name_f]Katinka[/name_f] (Kat, Tinka)
[name_f]Iolanthe[/name_f] (Io, Xanthe)
[name_f]Anoushka[/name_f] (Anoush, Anya)
[name_f]Giselle[/name_f] (Gigi, Zelda)
[name_f]Odette[/name_f] (Dodie, Etta)
[name_f]Hester[/name_f] (Hetty)
[name_f]Ondine[/name_f] (Dina)
[name_f]Ada[/name_f] - could also call her [name_f]Adie[/name_f] (a-dee) or [name_f]Addie[/name_f]
[name_u]Anne[/name_u] “Annie”
[name_f]Daphne[/name_f] “Dee” or “DeeDee”
[name_f]Edith[/name_f] “Edie”
[name_f]Eleanor[/name_f] “Nell” or “Nellie”
[name_f]Elena[/name_f] “Laney”
[name_f]Elizabeth[/name_f] “Libby”
[name_f]Emmeline[/name_f] “Emmy”
[name_f]Felicity[/name_f] “Lissy”
[name_f]Hazel[/name_f] “Hazy”
[name_f]Hester[/name_f] “Hettie”
Juliet/Juliette “Lettie”
[name_f]Katherine[/name_f] “Kitty” or “Katie”
[name_f]Matilda[/name_f] “Mattie”
[name_f]Teresa[/name_f] “Tessie”
Some of my favorites:
[name_u]Anne[/name_u] “Annie” & [name_f]Rosalie[/name_f] “Rosie”
[name_f]Matilda[/name_f] “Mattie” & [name_f]Hazel[/name_f] “Hazy”
[name_f]Edith[/name_f] “Edie” & [name_f]Felicity[/name_f] “Lissy”
[name_f]Ada[/name_f] & [name_f]Emmeline[/name_f] “Emmy”
[name_f]Katherine[/name_f] “Kitty” & [name_f]Teresa[/name_f] “Tessie”
[name_f]Elizabeth[/name_f] “Libby” & [name_f]Daphne[/name_f] “Dee”
[name_f]Hester[/name_f] “Hettie” & [name_f]Eleanor[/name_f] “Nell”
They’re great choices! And I understand where you’re coming from. [name_f]Ellie[/name_f] and [name_u]Allie[/name_u] are two of my favorite names ever, but I can see why you’d want to avoid another double L. It would be pretty similar to Ollie.