From Middle English bour, from Old English būr, from Proto-Germanic *būraz ("room, abode"). Cognate with German Bauer ("birdcage"), Old Norse búr (Danish bur, Norwegian Bokmål bur, Swedish bur ("cage").
From Middle English boueer, from Old English būr, ġebūr and Middle Dutch bouwer; both from Proto-Germanic *būraz, from Proto-Indo-European *bʰōw-. Cognate with German Bauer ("peasant, builder"), Dutch boer, buur, and Albanian burrë ("man, husband"). See boor, neighbor.