Clover - I like it. It's happy, springy, naturey, and cute. It's cute for a pet but I also like it for a human.
Capri - Hate it. Reminds me of Capri Sun and capri pants, not namey.
Cassandra - It's good, but overused. I still like it but it wouldn't stand out.
Calla - This is my favorite here. Short, pretty, simple, subtly floral.