That's sort of a trick question. When he was born on the planet Krypton, his parents named him Kal-e (the "eEl" at the end of his name is the family name, as in his father Jor-el's name). When he came to earth as a small child, the people who found him were Jonathan and Martha Kent. They adopted him and named him Clark after Martha's family, the Clarks. So you see, his name was BOTH Clark Kent AND Kal-el.
Superman's human name given to him by Martha and Johnathan Kent is Clark Kent. Superman's Kryptonian name given to him by Jor-El and Lara Lor-Van is Kal-El.
Kryptonian Name: Kal-El Earth Name: Clark Kent
His real name is Clark Kent and his girlfriend's name is Lois Lane.
Superman
Kal-El on his home planet of Krypton. Clark Kent by his adoptive family.
Superman's human name given to him by Martha and Johnathan Kent is Clark Kent. Superman's Kryptonian name given to him by Jor-El and Lara Lor-Van is Kal-El.
Clark Kent
Superman's secret identity as a reporter is Clark Kent.
Clark was Martha Kent's maiden name.
Superman's real name is Kal-El or Clark Kent. His girlfriend is Lois Lane, a fellow journalist at the Daily Planet.
Superman (the superhero) was Clark Kent. His alias "Superman" does not (I don't think) have a surname, however "Kent" was his real surname.
superman....(clark Kent)
Kryptonian Name: Kal-El Earth Name: Clark Kent
Superman was named Clark Kent by his foster parents, Jonathan and Martha Kent.
The name of Clark Kent's newspaper is the Daily Planet.
Clark Joseph (sometimes Jerome) Kent. A link to the Wikipedia post is provided.
Clark Kent is a fictional character who was created by Jerry Siegal and Joe Shuster. Clark Kent is also known by other names such as Kal-El (which was his birth name) and Superman.