So far I like her taste in names. Sage is very nice, although I'd be more inclined to use it in a middle name capacity (like one of my longtime favorites PhilippaSage), and ArloRobert is great!
I actually don't mind Arlo. It's smart in a hipster kinda way. Sage is less pleasing to me, but Arlo and Sage have a very cool urban-natural vibe going on.
I too am not keen on Arlo, it seems like a nickname to me. Robert is one of those classic names that sounds good with most first names.Sage is a guilty pleasure of mine. I love her full name SageFlorence.