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Casey is a given name, derived either from the Irish Gaelic cathasaigh, meaning vigilant or watchful, or from a combination of the initials K.C. It is in use for both boys and girls in the United States, often with variant spellings.1 It was the 326th most popular name for boys born in the United States in 2007 and the 458th most popular name for girls. It ranked among the top 200 names for both sexes in the 1990s.2 Variants include Caci, Cacey, Kacey, Kaci, Kacie, Kasey, Kaycee, Kayci, Kaysi, Kaysey, and Kaycie.
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