I like Rhianna, but only because that is my dd name! She is Rhianna Kate though. Rhianna Ava/Ava Rhianna doesn't really go together IMO. I do like Ava though! What we did was write down the combinations with our surname and kept on saying it out loud, to see if we really liked it. I think if you go with a long first name, tha middle name should be shorter and vice versa - of course IMO! gl.