She was born in Kensington, London, the daughter of prominent electrical engineers and inventors Hertha Marks Ayrton and William Edward Ayrton.
William Edward Ayrton (1847–1908), English physicist and electrical engineer
Chaplin and Ayrton's daughter was the feminist and author Edith Ayrton, wife of Israel Zangwill and mother of Oliver Zangwill.
(There had already been several foreign professors, such as William Edward Ayrton.)
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Matilda Chaplin Ayrton (1846–1883), doctor of medicine, first wife of William Edward Ayrton