From 風(し) (shi, (rare) wind) + 巻(ま)き (maki, 連(れん)用(よう)形(けい) (ren'yōkei, “stem or continuative form”) of the verb 巻(ま)く (maku, “to wind; to whirl”)).
風(し)巻(まき) • (shimaki) ←しまき (simaki)?