'Mark Twain' is a pen-name used by writer Samuel Langhorne Clemens. He worked on the Mississippi River as a steamboat pilot and named himself after the call used when sounding the depth of the river "by the mark twain": meaning that the river was two fathoms deep (6ft) which was a safe depth for the boat to travel.
Shania Twain
Susy Clemens, Mark Twains favored daughter.
Samuel Langhorne Clemens
Writing
The real name of the American author Mark Twain was Samuel Langhorne Clemens (1835 - 1910).
Mark Twain was the 'pen-name' of Samuel Langhorne Clemens
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Mark twain liked visiting libraries as a youngster.
Mark Twain's first name was Samuel. His full name was Samuel Longhorne Clemens.
Mark Twain's first job was as a typesetter.
November 30th 1835
Not really. It should be: "My father's dad's name is Mark Smith."