An Etymological Dictionary of the German Language/Annotated/Zeisig

Zeisig, masculine, ‘siskin,’ from the equivalent Middle High German zîsec, usually zîse, feminine. Borrowed, like Stieglitz and Kiebitz, from Slavonic (Polish czyż, Bohemian čižek), whence also Low German ziseke, sieske, Dutch sijsje. English siskin, Danish sisgen, Swedish siska.