I like it, it's my brother's name - and one of my nephew's middle names, after my bro. I've met several others, too. I couldn't use it because it would be way too confusing, but these sound good to me:
Rupert JamesRupert OliverRupert BarnabyRupert MorganRupert EdwardRupert ThomasRupert FraserRupert NicholasRupert CharlesRupert GeorgeRupert FrederickRupert GabrielRupert Aran