From *𐌲𐌻𐌰𐌲𐌲𐍅𐍃 (*glaggws) + -𐌱𐌰 (-ba), with root from Proto-Germanic *glawwaz.
𐌲𐌻𐌰𐌲𐌲𐍅𐌰𐌱𐌰 • (glaggwaba)