I think Gertie is cute. I don't mind Gertrude either. I think it can definitely be usable! It's got some nice nickname options besides Gertie too, like Tru or Trudie. It has that retro, vintage charm. :)
http://www.behindthename.com/pnl/72895
"It is human nature to think wisely and act in an absurd fashion." ~ Anatole France