Where does “ビスマーク” come from?

ビスマーク (Japanese) comes from English Bismarck, from German Bismarck.

Ancestry of “ビスマーク”, step by step

Step	Language	Word	Meaning
1	English	Bismarck	An apple cultivar from Australia; Alternative...
2	German	Bismarck	—

ビスマーク — Etymology, Origin & Word History | Etymology Explorer