Indian names

A little indian brave got curious one day, and asked his father how indians got their names.

"Well, If a big earthquake happens while the parents are making the baby, the little brave will be known as Shaking-ground", he replied sternly.

"If little brave is made while great flood is sweeping through the land, his name would be Running-water", he stated again.

"Now do you understand Broken-rubber?"