Is it farther or further?
1680s, alteration of huzza, similar to shouts recorded in German, Danish, Swedish. Perhaps picked up during Thirty Years' War. Hurra was said to be the battle-cry of Prussian soldiers during the War of Liberation (1812-13). Hooray is its popular form and is almost as old. Also hurray (1780); hurroo (1824); hoorah (1798).