Superman's Kryptonian name (S No. 113, May 1957: chs 1-3—"The Superman of the Past"; "The Secret of the Towers"; "The Superman of the Present"; and others). (TGSB)
Kal-El is ancient Kryptonian for "Star Child" (S No. 257/2, Oct 1972: "The Greatest Green Lantern of All!"; LSOK; and others).
The House of El was renowned throughout Kryptonian history for their great achievements in sciences and the arts.
Although born on Krypton, young Kal-El was rocketed to safety on Earth by his parents, Jor-El and Lara, before Krypton exploded. Upon his arrival on Earth, Kal-El was adopted by Jonathan and Martha Kent and raised as Clark Kent in Smallville.
Once he was of age, he began his career as Superboy and then later as Superman.
(See also Kal-L of Earth-2)