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I'd pick C over K any day. I just like that letter. Also a lot of names spelled with K are originally spelled with C, although some are just variants from another language.

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Courtney
Casey
Corey
Cillian
Carys
Clara
Cate or Kate are fine. I like Cate better myself mostly because it looks nicer to me and isn't as common.
Catherine, but nothing wrong with Katherine
Ciara