I just read a blog post where someone named their son Kepler though I'm not sure I like it as a first name. I do like Orion and Sirius I just hate the way they get pronounced by folks (OH-ryan and seeerius yuck!) I love Nova, Arista, Laine and Lyra.
Orion is more of an OAR sound than an OH sound and Sirious is more Si or Seh instead of See, I think its the over pronouncing of Oh and See that bug me a little.