Siday is a surname. Notable people with the surname include:
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R. E. Siday (1912–1956), English mathematician
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Eric Siday
Eric Siday (1 November 1905 – 26 March 1976) was a British-American composer and musician. While most commonly known for his pioneering work in electroacoustic music, his early career was that of a hot-jazz violinist in the London dance ban ...
(1905–1976), British-American composer and musician
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