From Proto-Germanic *dailiz, from Proto-Indo-European *dʰail-. Cognate with Old Frisian dēl, Old Saxon dēl (Dutch deel), Old High German teil (German Teil), Old Norse deild (Danish and Norwegian del, Danish spelling before the writing reform of 1948: Deel), Gothic 𐌳𐌰𐌹𐌻𐍃 (dails). The Indo-European root is also the source of Proto-Baltic *daili- (Lithuanian dailiti (“divide”)), Albanian thelë (“portion, piece”), Proto-Slavic *dělъ (Old Church Slavonic дѣлити (děliti), Russian делить (delitʹ)).
From Proto-Germanic *dalą, from Proto-Indo-European *dʰal-. Cognate with Old Frisian del, Old Saxon dal, Dutch dal, Old High German tal (German Tal), Old Norse dalr (Danish and Swedish dal), Gothic 𐌳𐌰𐌻𐍃 (dals). The Proto-Indo-European root is also the source of Ancient Greek θάλαμος (thálamos), Albanian dal (“to exit, unfold, sprout”), Proto-Slavic *dolъ (Old Church Slavonic долъ (dolŭ), Russian дол (dol)).