An Etymological Dictionary of the German Language/Klucke
Klucke, Glucke, f., ‘clucking hen,’ from MidHG. klucke. f., ‘brood hen,’ allied to MidHG. and ModHG. klucken (glucken). Comp. AS. cloccian, E. to cluck, Du. klokken. The Teut. cognate, klukk, is of onomatopoetic origin; comp. the phonetic cognates, Lat. glôcîre, Gr. γλώζειν, ‘to cluck.’