Orion is a rising star, with both mythical and celestial overtones. Heard sporadically in the late nineteenth century, it burst on the scene in full force in 1994 and has been shooting upwards ever since: it's now at Number 419.
The Greek mythological Orion was the legendary hunter who pursued the seven daughters of Atlas, was slain by the goddess Artemis, and then placed as one of the brightest constellations in the night sky by Zeus.
Mark Twain had a brother named Orion, and Chris "Big" Noth picked the name for his son. It is also a Harry Potter name.
Orion's Gaelic connection to O'Ryan/Ryan makes it familiar as well as exotic.