An Etymological Dictionary of the German Language/Gulden

by Friedrich Kluge

Gulden, m., ‘florin,’ from the equiv. MidHG. gulden, guldîn, m., ‘the golden coin,’ from MidHG. guldîn, ‘golden.’ The absence of mutation from u to ü is in accordance with the practice of earlier UpG. (Suab. Gülden).