Where does “𐌹𐌱𐌰𐌹” come from?

𐌹𐌱𐌰𐌹 (Gothic) comes from Proto-Germanic ibai, from Proto-Germanic jabai, from Proto-Indo-European ē- — then, at that time.

𐌹𐌱𐌰𐌹 (Gothic): Interrogative particle: starts a yes-or-no...