bök (North Frisian) comes from Old Frisian bōk, from Proto-West Germanic bōkijā, from Proto-West Germanic bōku, from Proto-Germanic bōkō, from Proto-Indo-European bʰeh₂ǵos — beech.
bök (North Frisian): book
Definitions
book
Ancestry of “bök”, step by step
bök traces back through two separate lines of ancestry.