Do not like Clarastella, but I do like Chiarastella. It sounds really lovely, but might be a tad too much. There are plenty of over-the-top names out there so I think it works anyway.
Clary is our "bright star" too. We named her
Clarisse Bituin (latinate clarice, and bituin - Tagalog word for star).
I also always thought something like Seren-Ming or
Estella Clare would be pretty (starbright)