The phrase is actually "sign your John Hancock." and comes from the signing of the Declaration of Independence. John Hancock's signature is by far the largest signature on the document; he was also the first to sign the document.
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Henry John Cambie died in 1928.
Henry John Wardell died in 1972.
John Henry Bowen died in 1822.
Henry John Boddington died in 1865.
John Henry Nicholson died in 1923.