Where does “θαυμάζω” come from?

θαυμάζω (Greek) comes from Ancient Greek θαυμάζω, from Ancient Greek θαῦμα, from Proto-Indo-European dʰeh₂u-, from Proto-Indo-European dʰeh₂-.

θαυμάζω (Greek): admire, feel admiration for; look up to, look at...