Where does “布爾什維克” come from?

布爾什維克 (Chinese) comes from Russian большеви́к, from Russian бо́льше.

布爾什維克 (Chinese): Bolshevik

Definitions

Step	Language	Word	Meaning
1	Russian	большеви́к	—
2	Russian	бо́льше	—

布爾什維克 — Etymology, Origin & Word History | Etymology Explorer