Mark Twain is nom de plume (a name used by an author instead of his rea name). It has no middle part. The author who used the name Mark Twain was Samuel Langhorne Clemens.
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'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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Mark twain liked visiting libraries as a youngster.
Mark Twain's real first name was Samuel. He was born Samuel Langhorne Clemens.
November 30th 1835
Mark Twain's first job was as a typesetter.
he invented to computer