west: [OE] Etymologically, the west may be the direction in which the sun goes ‘down’. Together with German and Dutch west, Swedish väster, and Danish vest, it comes from a prehistoric Germanic *westaz. This in turn was descended from the Indo-European base *wes-, which also produced Latin vesper (source of English vespers) and Greek hesperos ‘evening’ and was related to Sanskrit avas ‘down’. French ouest and Spanish oeste were borrowed from English west, Romanian vest from German west. => vespers[west etymology, west origin, 英语词源]