An Etymological Dictionary of the German Language/Kranz
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Kranz, m., ‘wreath,’ from the equiv. MidHG. and late OHG. kranz, m.; a specifically HG. word, which in this form has passed within historic times into other Teut. languages (Ic. krans, Du. krans). Perhaps allied to Sans. granth, ‘to tie (a knot), bind,’ granthi-s, m., ‘knot,’ or even with Lith. grandis, m., ‘bracelet, tyre of a wheel’ (Lett. grůdi, ‘wood for framing,’ from the base *grandai).