Why is the ninth month called September?
Old English hord "treasure, valuable stock or store," from Proto-Germanic *huzdam (cf. Old Saxon hord "treasure, hidden or inmost place," Old Norse hodd, German Hort, Gothic huzd "treasure," literally "hidden treasure"), from PIE root *(s)keu- "to cover, conceal" (see hide (n.1)).
Old English hordian, cognate with Old High German gihurten, German gehorden, Gothic huzdjan, from the root of hoard (n.). Related: Hoarded; hoarding.