It's a girl, duh

So Payton tells me a story last night about a kid named Avery in her class. I asked if Avery was a boy or a girl. She looked at me like I was dumb and said it was a girl with a tone in her voice that she couldn't believe I would even ask. So I said, well Avery Pawlak is a boy. She then said, "But her name is Avery JOHNSON, duh." Ah.... the all telling last name indicates that she is a girl.