Shania Twain
Susy Clemens, Mark Twains favored daughter.
Samuel Langhorne Clemens
Mark Twain's first name was Samuel. His full name was Samuel Longhorne Clemens.
The real name of the American author Mark Twain was Samuel Langhorne Clemens (1835 - 1910).
Garrett Morgan's middle name was Augustus.
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Augustus
Mark Twain's pseudonym was his pen name, as an American writer and humorist, Samuel Langhorne Clemens, is better known by the pen name Mark Twain.
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The founder of the NFL's Decatur Staleys, which later became the Chicago Bears, given name is Augustus Eugene Staley.
In the case of Mark Dean the swimmer, the middle name is John In the case of Mark Dean the footballer, the middle name is Leslie In the case of Mark Dean the scientist, the middle initial is E.