How Indian's get their name.

So two indian boys are playing outside, when one of them wonders how people get their names. Wanting to know, he goes to the chief and asks him,
"where do names come from?" The chief says,
"well when a baby is born the dad will go outside to find it" he goes on pointing at another boy,
"look at lighting over there or thunder cloud." The boy says
"Thank you chief", to which the chief replies
"Why do you ask, two dogs fucking".