Another vote for [name_f]Lucy[/name_f] [name_f]Caroline[/name_f]. I don’t think the alliteration is a problem at all. Her full name probably won’t be said out loud very often and [name_f]Lucy[/name_f] [name_f]Caroline[/name_f] is an awesome combo!
I absolutely love [name_f]Leah[/name_f]! [name_f]Leah[/name_f] is so versatile and timeless. [name_f]Lucy[/name_f] is sweet, but we had a family dog for 16 years named [name_f]Lucy[/name_f] and I will always make the pet association.
[name_f]Marielle[/name_f] is not my style, but a pretty middle name choice.
To answer your other question, I don’t think the C/K alliteration is an issue at all.
[name_f]Leah[/name_f]. It’s one of my favourites, although [name_f]Leah[/name_f] [name_f]Marielle[/name_f] is a bet eh (prefer [name_f]Leah[/name_f] [name_f]Caroline[/name_f]).
I love both [name_f]Lucy[/name_f] and [name_f]Leah[/name_f]. [name_f]Lucy[/name_f] [name_f]Caroline[/name_f] is a divine combo. [name_f]Leah[/name_f] [name_f]Caroline[/name_f] would be lovely as well.