[name_f]Clara[/name_f] [name_f]Ann[/name_f] is beautiful 
Of your list, I really like:
[name_f]Lucy[/name_f] [name_f]Joy[/name_f] or [name_f]Lucy[/name_f] [name_u]Wren[/name_u] → strong, sweet, and sparkly. [name_u]Wren[/name_u] adds a more modern vibe; [name_f]Joy[/name_f] gives it vintage charm
[name_f]Thea[/name_f] [name_f]Grace[/name_f] → sweet, fresh and lively
[name_f]Rosalie[/name_f] [name_f]May[/name_f] → bright, musical and lovely
[name_f]Iris[/name_f] [name_f]Mae[/name_f] → sharp, sweet and charming
[name_f]Mae[/name_f] [name_f]Juliet[/name_f] → bright and vintage
[name_f]Poppy[/name_f] [name_u]Sloane[/name_u] and [name_f]Poppy[/name_f] [name_u]Rae[/name_u] → bubbly and sweet, and I like the balance
[name_f]Juliet[/name_f] [name_f]Joy[/name_f] → sophisticated and lovely
[name_u]Josie[/name_u] [name_f]Kate[/name_f] → lively, fun and sparkly
[name_u]Zoe[/name_u] [name_f]Grace[/name_f] → sparky, bubbly and bright but established
I also like [name_f]Autumn[/name_f] too 
If I could mix and match the middle choices:
[name_f]Autumn[/name_f] [name_f]Kate[/name_f], [name_f]Autumn[/name_f] [name_f]Grace[/name_f] and [name_f]Autumn[/name_f] [name_f]Juliet[/name_f]
[name_u]Zoe[/name_u] [name_f]Autumn[/name_f] or [name_u]Zoe[/name_u] [name_f]Isobel[/name_f]
[name_f]Thea[/name_f] [name_f]Juliet[/name_f] or [name_f]Thea[/name_f] [name_f]Isobel[/name_f]
[name_f]Noelle[/name_f] [name_f]Juliet[/name_f] or [name_f]Noelle[/name_f] [name_f]Iris[/name_f]
A few suggestions:
[name_f]Clara[/name_f] [name_f]Ann[/name_f] and…
[name_f]Eleanor[/name_f] [name_f]Joy[/name_f]
[name_f]Matilda[/name_f] [name_u]Wren[/name_u]
[name_u]Ruby[/name_u] [name_f]Joy[/name_f]
[name_f]Phoebe[/name_f] [name_u]Rae[/name_u]
[name_f]Pippa[/name_f] [name_u]Louise[/name_u]
[name_f]Summer[/name_f] [name_f]Juliet[/name_f]
[name_f]Tallulah[/name_f] [name_f]Eve[/name_f]
[name_f]Betsy[/name_f] [name_f]Kate[/name_f]
[name_f]Eve[/name_f] [name_f]Lily[/name_f] / [name_f]Eve[/name_f] [name_f]Lillian[/name_f]
[name_u]Romy[/name_u] [name_f]Isobel[/name_f]
[name_f]Stella[/name_f] [name_f]Juliet[/name_f]
[name_f]Mabel[/name_f] [name_f]Lucy[/name_f]