When I was 10 I got an Eastern Box Turtle and according to all the reptile books it was a boy. She had red eyes, and a lot of red, orange and yellow on her legs and head. The females were supposed to have brown or pink eyes and not be so brightly colored. Well, Max laid eggs. Of course everyone suggested I change her name to Maxine, but I just left her Max. I ended up having her for more than 20 years. She laid eggs one more time, and that was that. I also had a crayfish that I named Herbie, who was apparently pregnant when I got her. Next thing I knew she had all these eggs under her tail, and then I had at least 50 crayfish!
Obviously my Merlin was named before her previous owners knew gender. Hence adding the Ms in front of her name, lol! She seems to like being called Merloony or Loony Bird though, so that is what I call her.
We didn't know Pete's gender either. I thought, well, I hope he's a boy after being called one for 28 years. He's doing boy hormonal things though so I'm sure he actually is one.