I’m looking for sibling girl names to match our daughter [name_f]Mabel[/name_f]. Strong yet feminine names that are more than one syllable and not too common!! I’m racking my brain but the creative juices are not flowing. Thanks for your help! 
[name_f]Agnes[/name_f]
[name_f]Clara[/name_f]
[name_f]Cordelia[/name_f]
[name_f]Della[/name_f]
[name_f]Edith[/name_f]
[name_f]Elise[/name_f]
[name_u]Eloise[/name_u]
[name_f]Elsie[/name_f]
[name_f]Emilia[/name_f]
[name_f]Estelle[/name_f]
[name_u]Evelyn[/name_u]
[name_f]Felicity[/name_f]
[name_f]Hazel[/name_f]
[name_f]Iona[/name_f]
[name_f]Iris[/name_f]
[name_f]Molly[/name_f]
[name_f]Phoebe[/name_f]
[name_f]Thea[/name_f]
[name_f]Violet[/name_f]
[name_f]Willa[/name_f]
[name_f]Cora[/name_f]
[name_f]Flora[/name_f]
[name_f]Florence[/name_f]
[name_f]Frances[/name_f]
[name_f]Etta[/name_f]
[name_f]Eliza[/name_f]
[name_f]Edith[/name_f]
[name_f]Delia[/name_f]
[name_f]Clara[/name_f]
[name_f]Georgia[/name_f]
[name_f]Gwyneth[/name_f]
[name_f]Gwendolen[/name_f]
[name_f]Hattie[/name_f]
[name_f]Iris[/name_f]
[name_f]Josephine[/name_f]
[name_f]Lenora[/name_f]
[name_f]Leona[/name_f]
[name_f]Fiona[/name_f]
[name_f]Olive[/name_f]
[name_f]Serena[/name_f]
[name_f]Susannah[/name_f]
[name_f]Tallulah[/name_f]
[name_f]Tessa[/name_f]
[name_f]Viola[/name_f]
I was going to mention most of the above names, but they only one that I don’t see up there that is great for your style is [name_f]Britta[/name_f]. The hard t sound in the middle makes it sound strong, and it has more than one syllable. Another option is McKenna nn Mack or Kenna. That matches initials with Mabel. Hope this helps and Good luck!
[name_f]Mabel[/name_f] is a lovely Name! Usually in my lists I pair her with the exquisite [name_f]Florence[/name_f]! [name_f]Mabel[/name_f] [name_f]Flora[/name_f] and [name_f]Florence[/name_f] [name_f]May[/name_f] are dreamy for Identical Twins!! Anyway, some other Names I love to group her with are:
[name_f]Clara[/name_f]
[name_f]Elise[/name_f]
[name_f]Tabitha[/name_f]
[name_f]Jemima[/name_f]
[name_f]Louisa[/name_f]
[name_f]Flora[/name_f]
[name_f]Lucinda[/name_f]
[name_f]Louise[/name_f]
[name_f]Lucia[/name_f]
[name_f]Marigold[/name_f]
[name_f]Greta[/name_f]
[name_f]Carol[/name_f]
Sorry for any repeats:
[name_u]Evelyn[/name_u]
[name_f]Eveline[/name_f]
[name_f]Adeline[/name_f]
[name_f]Adele[/name_f] (if you don’t mind her having the same same as the singer)
[name_f]Louise[/name_f]
[name_f]Emilia[/name_f]
[name_f]Amelie[/name_f]
[name_f]Amity[/name_f]
[name_f]Verity[/name_f]
[name_f]Stella[/name_f]
[name_f]Willow[/name_f]
[name_f]Zara[/name_f]
[name_f]Violet[/name_f]
[name_f]Poppy[/name_f]
[name_f]Ivy[/name_f] (don’t know how popular this is)
[name_u]Halle[/name_u]
[name_f]Eva[/name_f]
[name_f]Evangeline[/name_f]
[name_f]Carolina[/name_f]
[name_f]Miriam[/name_f]
[name_u]Eloise[/name_u]
[name_f]Elodie[/name_f]
[name_f]Lilia[/name_f]
[name_f]Lila[/name_f]
[name_f]Meline[/name_f]
[name_f]Bridie[/name_f]
[name_f]Destiny[/name_f]
[name_u]Harper[/name_u] (again not sure how popular it is)
[name_u]Harmony[/name_u]
[name_f]Maeve[/name_f]
[name_f]Mae[/name_f] (common as a middle name but rarely used as a first)
[name_f]Maeva[/name_f]
[name_f]Mabel[/name_f] is a beautiful name that it is not at all common today. I hope you find something that you love. Good luck! 
I like [name_f]Mabel[/name_f] and [name_f]Justine[/name_f] together. PP’s suggestion of [name_f]Britta[/name_f] is lovely too.
[name_m]Just[/name_m] suddenly thought of [name_f]Mabel[/name_f] and [name_f]Lilac[/name_f]! Please tell us what you are thinking!
[name_f]Ada[/name_f]
[name_f]Alice[/name_f]
[name_f]Audrey[/name_f]
[name_f]Beatrice[/name_f]
[name_f]Charlotte[/name_f]
[name_f]Daisy[/name_f]
[name_f]Isla[/name_f]
[name_f]Ivy[/name_f]
[name_f]Sadie[/name_f]
[name_f]Willa[/name_f]
[name_f]Mabel[/name_f] is one of those lovely old-fashioned names, but it hasn’t gained the crazy popularity yet of others in that category. I think it would be great to pick another not so common old-fashioned names like [name_f]Florence[/name_f], [name_f]Edith[/name_f] or [name_f]Viola[/name_f].
I know a sibling set of sisters named [name_f]Mabel[/name_f] and [name_f]Stella[/name_f]. That works well. Or what about:
[name_f]Iris[/name_f]
[name_f]Cleo[/name_f]
[name_f]Brynn[/name_f]
[name_f]Opal[/name_f]
I love the name [name_f]Mabel[/name_f]!
[name_f]Mabel[/name_f] and…
[name_f]Louisa[/name_f]
[name_f]Clara[/name_f]
[name_f]Elsie[/name_f]
[name_f]Alice[/name_f]
[name_f]Willa[/name_f]
[name_f]Lucy[/name_f]
[name_f]Josephine[/name_f]
[name_f]Cora[/name_f]
[name_f]Emily[/name_f]
[name_f]Georgia[/name_f]
[name_f]Adelaide[/name_f]
[name_f]Fiona[/name_f]
[name_f]Ivy[/name_f]
[name_f]Sylvie[/name_f]
[name_f]Beatrice[/name_f]/[name_f]Beatrix[/name_f]
[name_f]Caroline[/name_f]
[name_f]Edith[/name_f]