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What is notable about George M. Cohan’s family background?

George M. Cohan (1878–1942) was the son of Irish immigrants. The family name was changed from O’Caomhan to Keohane, then to Cohan after his grandparents arrived in the United States. Cohan’s official birthday is July 3, 1878, but his parents claimed he was born on July 4, aligning with U.S. Independence Day.