These are others I came up
[name_f]Mirabelle[/name_f] [name_f]Clara[/name_f] is lovely!
I [name_u]LOVE[/name_u] the name [name_f]Mirabelle[/name_f], so happy to see it being used. I think you should go with [name_f]Nora[/name_f] in the middle if that’s your favorite of the middle options (I like the shorter, two syllable choices, myself: [name_f]Nora[/name_f], [name_f]Greta[/name_f], [name_f]Clara[/name_f], and [name_f]Zadie[/name_f]).
Of these I really like the sound of [name_f]Mirabelle[/name_f] [name_f]Maisie[/name_f], [name_f]Mirabelle[/name_f] [name_f]Pearl[/name_f], and [name_f]Mirabelle[/name_f] [name_f]Poppy[/name_f].
Some others I might suggest: [name_f]Mirabelle[/name_f] [name_f]Paula[/name_f], [name_f]Mirabelle[/name_f] [name_f]Audrey[/name_f], [name_f]Mirabelle[/name_f] [name_f]Briar[/name_f], [name_f]Mirabelle[/name_f] [name_u]Blake[/name_u]