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This is not a newly invented spelling, but as the previous poster pointed out, is a surname in the USA, made famous by the psychic Edgar Cayce. There is also a city called Cayce in South Carolina, a suburb next to Columbia, the capital city. And both the family name and the city in South Carolina are pronounced as "Casey", not as "Case."

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http://reference.allrefer.com/gazetteer/C/C03724-cayce.html