Orion
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I like Orion a lot. You could use names from the stars in it, like Rigel, Saiph or Betelgeuse (you probably think NOT, but it is cool, at least in my opinion), or other constellation names, like Cepheus, Draco, Leo and Perseus. The moment I see Orion I think of the stars, so those are the names with similar feels to me. And Bellatrix, Meissa, Andromeda and Lyra would be excellent as sisters for Orion, but you didn't ask about girls.
Oberon comes to mind.