An Etymological Dictionary of the German Language/Annotated/Brombeere
Brombeere, feminine, ‘blackberry,’ from the equivalent Middle High German brâmber, Old High German brâmberi; literally ‘bramble-berry,’ Old High German brâmo, Middle High German brâme (also ‘briar’ generally). Akin to Anglo-Saxon brôm, English broom (Modern High German Bram, ‘broom for besoms); Anglo-Saxon brêmel, ‘thorny plant,’ English bramble, Dutch braam, ‘bramble-bush,’ whence French framboise.