David is the great earthly king of Israel that JESUS Christ was from the family lineage of, though JESUS is completely Divine. Kings wear crowns. This is the Star of David. JESUS is the King of kings and also wore a crown on this earth in His suffering to reconcile us to GOD. JESUS wore a crown of thorns. I think that possibly prophetically the symbol of the star of David (Israel's great earthly king who wore a crown) also looks like a symbol that could represent a crown of thorns that JESUS would later wear to become the Savior of the world as the promised Messiah from the Old Testament of the Bible. Compare they symbol to the image of the real thing and see if you think there is a connection.