There’s an interesting site called www. howmanyofme. com which lets you search for names (both first and last names) to see how many people in America go by that name.
According to the site, there are quite a few people with Superman related names in America:
Clark Kent = 7
Lois Lane = 180
Jimmy Olsen = 59
Perry White = 216
Lana Lang = 9
Pete Ross = 47
Interestingly, “Luthor” is not a surname used by anyone in America.
source: supermanhomepage. com