Sorry, I'm at work. I'm not very familiar with all the great mythos of this name(my wife would know more than I). I chose this name 10 years ago because it is the title of my favorite song. I know it is the name of a constellation. You'd think id know more of it since I loved Mythology and had two classes on it in high school and one in college, but I don't remember them talking too much about him. I'm a Halo fan and I know it was the name of the first failed Spartan Project. If you would like to enlighten please feel free. I love hearing I this stuff. :)

Orion was a giant who was created by Gaea (the earth goddess) to oppose the Gods in a war. But Orion didn't want to fight against the Gods, rather he chose his own destiny! He became the first guy to become a hunter of Artemis (a group of servants for Artemis, the Goddess of The Hunt) and hunted with them. Unfortunately he fell in love with the maiden Artemis and she had to slay him. But then he came back hunting and killing all Hunters. I love Greek Mythology ;)