From Proto-Germanic*hiu dagu(“this day”, instrumental), from Proto-Germanic*hiz(“this”) + *dagaz(“day”). Cognate with Old Frisian hiūdega, hiōda(“today”), Old Saxon hōdigo, hūdigu(“today”), Old High German hiu tagu, hiutu, hiuto("today"; > German heute), Gothic 𐌷𐌹𐌼𐌼𐌰 𐌳𐌰𐌲𐌰(himma daga). More at he, day.