Its source is esaw, a Hebrew name meaning "Hairy."
This boy's name is used in Hebrew.
In the Jewish scriptures, Esau was the eldest son of Isaac. He sold his birthright to his younger twin, Jacob, for a bowl of soup. To add insult to injury, Jacob later duped their father into blessing him in Esau's stead, covering his forearms with goatskins to trick the blind old man into believing Jacob was his hairy brother.