Quote from Rachel in The One Where Chandler Takes a Bath
Dr. Long: All your tests look fine. Now, are you two interested knowing in the sex of the baby? Ross: No. No, we're not. Rachel: But you have it right there? You could tell us whether it's a boy or a girl? Dayton or Sandrene? Phoebe or Pheebo? Dr. Long: That's right. But if you don't wanna know- Ross: No, we wanna wait. Right? Rachel: Right. Right. Dr. Long: Oh, I'll be right back. And I know it's really not my place, but please don't name your child Pheebo.