Goliath: Descendent of Sons of GOD
Sons of GOD in Genesis 6 in Hebrew is called Elohim. When the Sons of GOD saw the daughters of men they thought they were beautiful. The offspring of these Sons of GOD and daughters of men were giants. The genetic makeup of these offspring was carried down into the rest of the human race. That is why Goliath was a giant, because he was a decedent of Sons of GOD.