From Middle English hade, had, hod, hed, from Old English hād, from Proto-Germanic *haiduz, from Proto-Indo-European *(s)kāy-. Cognate with Old Saxon hēd, Old High German heit, Old Norse heiðr (whence Danish hæder, Swedish heder), Gothic 𐌷𐌰𐌹𐌳𐌿𐍃. Same as -hood.
Origin uncertain. Perhaps from a dialectal form of head.