"THE MOST COMMON SET OF INITIALS FOR SUPERMAN'S FRIENDS AND ENEMIES IS L.L."
Hum....I could only think of three...Lois Lane, Lex Luther, and Laura Leigh (haha).
So, I had to Wikipedia it and find the others. It appears that you probably had not heard of them unless you read the actual comic book. They are: Linda Lee, Lana Lang, Lori Lemaris, and Lucy Lane.
Now we can rest easy.....LOL.