Since [name_u]Charlie[/name_u] and [name_f]Tilly[/name_f] are given names, I’d only give your second daughter a full name that’s short and simple like [name_f]Vera[/name_f] or [name_f]Ada[/name_f], or had a really great shortform/nickname like [name_f]Edith[/name_f]/[name_f]Edie[/name_f], [name_u]Josie[/name_u]/[name_u]Jo[/name_u], [name_f]Frances[/name_f], [name_f]Florence[/name_f], etc.
What about [name_f]Lisbeth[/name_f] as a first name instead of [name_f]Elizabeth[/name_f] as a middle? Then you have [name_f]Bess[/name_f], [name_f]Bessie[/name_f], [name_f]Betsy[/name_f], [name_f]Bets[/name_f], [name_f]Betty[/name_f] or [name_f]Lissie[/name_f], [name_f]Lise[/name_f] as shortforms to use, but the given name is still sweet enough to go with [name_u]Charlie[/name_u] and [name_f]Tilly[/name_f] without dwarfing them like [name_f]Elizabeth[/name_f] would. I also recommend [name_f]Embeth[/name_f] with the shortforms [name_f]Em[/name_f], [name_f]Emmie[/name_f], [name_f]Betsy[/name_f], [name_f]Betty[/name_f] or [name_f]Bets[/name_f].
To me, the names most similar to [name_f]Beatrice[/name_f] are [name_f]Frances[/name_f] and [name_f]Florence[/name_f]. I love [name_f]Tilly[/name_f] and [name_f]Frances[/name_f] as sisters. But [name_f]Florence[/name_f] has amazing nicknames, too. ([name_f]Alice[/name_f] is similar too but I don’t like [name_f]Alice[/name_f] and [name_f]Tilly[/name_f] together.)
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Ida[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Ruthie[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Betsy[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Annie[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Rosie[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Maggie[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Gracie[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Lottie[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Edie[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Ada[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Maud[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Jane[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Janie[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_u]Josie[/name_u]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_u]Jo[/name_u]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_u]Joan[/name_u]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Joni[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Vera[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Gwen[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Gwennie[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Evie[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Frances[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_u]Frannie[/name_u]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_u]Fran[/name_u]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_u]Frankie[/name_u]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Florence[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Florrie[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Flossie[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Flor[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Flo[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Embeth[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Emmie[/name_f]
[name_u]Charlie[/name_u], [name_f]Tilly[/name_f] and [name_f]Lisbeth[/name_f]