An Etymological Dictionary of the German Language/Annotated/Klucke
Klucke, Glucke, feminine, ‘clucking hen,’ from Middle High German klucke. feminine, ‘brood hen,’ allied to Middle High German and Modern High German klucken (glucken). Compare Anglo-Saxon cloccian, English to cluck, Dutch klokken. The Teutonic cognate, klukk, is of onomatopoetic origin; compare the phonetic cognates, Latin glôcîre, Greek γλώζειν, ‘to cluck.’