We find this name in part of a long title in Isaiah 9:6.
This prophetic passage from Isaiah is often read during the Christmas season. The name El-Gibhor is a name for God, translated as Mighty God. We believe this passage describes the strength and rule of Jesus, as depicted in Revelation 19:15 - Coming out of his mouth is a sharp sword with which to strike down the nations. "He will rule them with an iron scepter." He treads the winepress of the fury of the wrath of God Almighty.