‘[Old English] Old English duce describing this swimming bird, is from the Germanic base of the verb duck ‘to dip under’. It is sometimes used as a term of endearment (Shakespeare Midsummer Night’s Dream: “O dainty duck, o deare!” Dickens Old Curiosity Shop: “How is he now my duck of diamonds”).
The use of the word in cricket to signify no score, is short for a duck’s egg, because of the similarity in shape between the egg’s outline and the figure zero.’
– Chantrell. G. edt. 2002. The Oxford Essential Dictionary of World Histories New York, United States: Berkley Publishing Group (2003) p. 163