Why did mark twain decide to change his name to mark twain?
Why Samuel Clemens wrote under a pseudonym is a mystery to me. Mark Twain is actually a depth reading from a riverboat, and I know Clemens was a pilot on a river boat among other things. He may have used the name as an insider name for the region in which he lived. Something similar to rappers today, and the evocative names by which they are known.