Moishe Cohen goes to his rabbi.
"I need your advice. My wife just gave birth to a girl."
"Mazel tov."
"Thank you. Can we name the baby after a relative?"
"According to Jewish custom, you can name a baby after a departed father, mother, brother..."
"But they are all still alive," says Moishe.
"Oh, I'm terribly sorry to hear that," said the rabbi.