Proto-Germanic: *bō[w]-an- m., *bōlan- m., *bōlōn- f.
Meaning: brother, close relation
Norwegian: dial. boa 'Bruder'
Middle Low German: MLG bōle 'Bruder, näher Verwandter, Amstbruder'
Middle High German: buole wk. m., f. 'naherverwandter, geliebter, keibhaber, geliebte'