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human
[ASOIAF] Why did Lollys name her kid Tyrion? And why's the little kid's last name Tanner?

You'd think he'd be a Stokeworth like Lollys or assume whatever Bronn's last name is.
gpt
The closest thing Bronn has to a last name is "of the blackwater." Lowborn people in Westeros often don't have last names.

They named the kid Tyrion because Bronn is a cocky jokester. It was sort of in honor of his boss and almost friend Tyrion Lannister, but also just to freak out Cersei.

He's a Tanner and not a Stokeworth because he's a bastard. Nobody knows who the kid's father actually is, but Lollys was raped near a tanning shop, so they went with Tanner as a last name.