I think, if you like [name_f]Louisa[/name_f] more, that it can absolutely work. [name_f]Elsa[/name_f], [name_f]Julia[/name_f], and [name_f]Louisa[/name_f] are a great sib set–but even more importantly, [name_f]Louisa[/name_f] is a name that you love all by itself. At the end of the day, I think it matters more that each of your girls has a name you love than that their names go perfectly together. If you feel more confident using [name_f]Clara[/name_f], I say go for it–you really can’t go wrong there. It’s such a beautiful name with a great meaning. But if you just need a little encouragement to use [name_f]Louisa[/name_f]? Lots of siblings have names that share sounds. [name_f]Elsa[/name_f], [name_f]Julia[/name_f], and [name_f]Louisa[/name_f] are distinct names with separate histories, meanings, etc. And more importantly, your girls will each be their own people, no matter what you call them! I wonder if it might help you to “test drive” each name for a day or two and see how each one feels and fits in with her big sisters’ names?