He didn't even learn his name was Kal El until latter in life. He grew up being Clark and that is his name. I was adopted and before I was I am told they called me Paul in the place I was when I was a baby . Does that mean I should go by Paul now when I have been Kris since I was adopted? No. My name is the one my parents gave me just like Clark Kent is the name the people who raised him and he called mom and dad named him. Kal El should mean a lot to him but the name he has gone by most of his life is Clark.