Riley Graham- i'm always thrilled to see Riley on a boy (where it belongs), because lately it's been hijacked for girls. Graham is a nice strong name. however, Riley Graham doesn't flow well IMHO, it's a bit bumpy in sound.
John Ashby- John is a bit boring as a first name. i dont mind it as a middle and spelled Jon as part of a two middle name combo such as- Jon Luke or Jon Paul etc. Ashby is darling. mybe Jonathan Ashby? i has a bit more weight to it. i get that John is a family name but you can still honor family without having to be literal. my own middle son's middle name is a Jon two name combo and he's named after my Pap Pa (grandfather) John.
Quinn Matthew- i find the extra N on Quinn odd, though i know it's commonly spelled that way, i prefer it as Quin, since generally it's a nickname for Quinton or Quincy- both of which have only 1 Q in the 'quin' part of the name. Matthew i find boring filler. it's overused....i get that it's family but it's just boring to me.
Robert Christopher- this is just perfect, i LOVE this. i dont care for Robbie as a nickname esp if spelled w/an -ie-, 'Robby' would look more masculine, i prefer either Rob or Bob. very nice name though.
Ethan Oliver- this is really cute!! Ethan is a very common name though so i'm not sure. i really like the flow of this though. it's quite nice.
Oliver Quinn- this flows beautifully! great name. (again same as above for the double Ns on Quin)