Sorry, but where are people getting this name from?

Esau is Jacob's twin brother in the bible who wants to kill Jacob for taking his right to their father heir. This is also intersting:

One day, Esau returned from an unsuccessful hunting trip and was famished. He saw that Jacob had been cooking food and he asked for a serving. Jacob asked him if he would be willing to sell his rights as the first-born son in exchange for a bowl of food. Esau agreed. (Genesis 25:29-34 (http://www.biblegateway.com/passage/?search=Genesis%2025:29-34&version=31).)

When Jacob asked if "Esau" wanted some of his fish he said no, almost as if he learned his lesson from that a long time ago. Could be wrong but i guess we'll see.....in 9 months! ugh!