i dont necessarily think you need more than one name picked out! we only ever had one of each regardless of whether it 'suited' them or not!! i remember both times as soon as we discovered what we'd had be automatically said their name and that was that! i think having more than one and having time to think about may sway your mind IYKWIM, if you both love a name, stick with it and go with it!!
i love arielle!