holy: [OE] Holy originated as a derivative of the prehistoric Germanic adjective which produced modern English whole, and so its etymological meaning is perhaps ‘unimpaired, inviolate’. This ancestral form was *khailagaz, which diversified into German and Dutch heilig, Swedish helig, and Danish hellig as well as English holy. Hallow is essentially the same word, and compounds with holy as a now hidden component include hollyhock [13] as well as holiday. => hallow, holiday[holy etymology, holy origin, 英语词源]