Well, Sorrel isn't exactly a usual kind of name either - not least because it's from a sour herb (and literally means "sour"!)
I've never heard of anyone in real life called Wish, but I can imagine "creative" parents picking it as a name. Names like Faith, Hope, Charity, Grace and so on were quite common years ago (when sounding appropriately churchy was more popular). I knew a couple once who named their son Dragon, and another couple who named their son Phoenix - both of which, to me, are just too cruel for a child to have to grow up with, but oh well...
I heard more recently of a lady (from the US) called Stormy, which apparently was her real name... if so, I can only imagine what kind of baby she must have been for her parents to call her that!
Oh yes, and years ago, I knew of a girl about my age whose first name was Precious - I never met her personally, but have always wondered how she must have endured the inevitable Gollum jokes.