Greer is the name of the (lady) villain in a story I wrote, though I could see it being used on a boy. Of your combos, I like Greer Samuel, Greer Silas, and Greer Miles the best. I think Greer might work better as a middle name, though.
"Night fell, lots of large stars came out, and the Hemulen loved his park all the better. It was wide and mysterious; one could lose one's way in it and still be at home."
-Tove Jansson