I don't know any Reubens but then I am old and my children are all above 13. but I have noticed a rise in the last 5 years or so in the number of Jewish or Old Testament biblical names, mostly for boys, but a few girls ones as well. Those, and Welsh/Cornish names seem to have taken over from the Celtic thing that was going on all through the 90's and the noughties.
It's funny because people on MN often say 'oh, Liam/Caitlin/Ryan/Riley is a so common and chav' and then they will coo and bill over Seren or Evan or Eleri or Celyn, but in ten years time someone else will be on here saying the same thing about those, or all the Noahs and the Ashers!
I have decided you either have to:
Pick from the classics
Pick truly outlandish and totally unheard of things, or names which are deeply unfashionable because they are from your own or your parents generation, rather than from your grandparents, and that don't follow any kind of emerging trend (see Celtic/Jewish/shakespearean or whatever)
Pick what you like and really not care if there will be four in the class or if someone thinks its common.
Otherwise you are doomed.