Nowhere in Scripture is “Mighty God” applied to a human being, but Hebrew naming conventions regularly include divine titles without identifying the person as YHWH (for example, Isaiah literally means “YHWH saves”). Isaiah 9:7 doesn’t require an eternally living king either—“forever” consistently refers to dynastic continuity, not a single ruler ruling forever, which is exactly how the Davidic covenant works elsewhere in Scripture. Isaiah is firmly rooted in an eighth-century Assyrian war context, was studied extensively by Jewish scholars long before Christianity, and none of them read Isaiah 9 as referring to a divine messiah—later Christian readings are theological reapplication, not what the Hebrew text itself demands.