What is the story behind mark twais's name?

Answer 1

the name mark twain is a pseudon of samuel langhorne clemens

Answer 2

Mark Twain was the pen name used by the American author and humorist Samuel Clemens. "Mark Twain" comes from a term used by riverboat pilots on the Mississippi River, indicating a water depth of two fathoms, or 12 feet, which was safe for navigating. Clemens adopted this name as his pen name while working as a journalist and eventually began using it for all his published works.