I don't dislike Ruby and prefer it to the likes of Chrystal, Opal, Topaz, Jade, Sapphire or Esmerelda. But I am not sure I would use it in real life tho I had a step grandmother called Ruby. I am also old enough to think of, Ruby Don't Take Your Love To Town, by Kenny Rodgers.
I like Bryony or Briony and I believe its usage was more common in Scotland than in the rest of the UK. It is recognisable but not overly popular. Again, tho I would not use it myself, tho.