I was wondering this too, because this is an almost word-for-word line from season 2 of "I
Love Lucy", in the episode known as "Pregnant Women are Unpredictable".
The conversation:
Lucy: Well, I'm not gonna settle on any old thing. I want the names to be unique and euphonius.
Ricky: OK,
Unique if it's a boy and Euphonius if it's a girl.