Ryker is awfully close to Ryder. Paxton is OK (it certainly beats the Jayden, Braden, Caden, Hayden and Paydens of the world) but Jasper is a bit more unique. It was popular in Georgian times in England and I think it is a handsome name.
Paxton is awesome but Jasper seems to 'fit' better with Phoenix... Not that they have to match though! Good unique names there!
My son is called Jaspa :)
I love the name jasper it's very cute but Paxton is unique an different so I pick Paxton