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A surname from Middle English derived from several Old and Middle English words; also adopted by immigrants whose surnames began with a K. examples
A male given name from Welsh derived from the surnames, or from a rare medieval given name (as the Sir Kay of Arthurian legend), Welsh Cai, Latinized as Caius, related to the modern male name Kai. examples
A short form of Katherine and other female names beginning with a "K"; popular as a middle name. quotations examples
She frowned at the girl's response. "Kay?" she said. "That is not a name. And what of your family?" "Catalina," the girl amended quickly. "I am used to being Kay at work. My family name is Gómez - we come from Mindanao, where we had pineapple plantations […]"
1970, Santha Rama Rau, The Adventureress, Harper&Row, pages 99–100