Alliteration with character names in comics is quite common.
Clark Kent
Lois Lane
Lana Lang
Lori Lemaris
Lex Luthor
Bruce Banner
Doctor Doom
J. Jonah Jameson
Killer Croc
Martian Manhunter (J'onn Jones)
Matt Murdock (DareDevil)
Peter Parker
Reed Richards
Scott Summers
Silver Sable
Silver Surfer
Warren Worthington
Wonder Woman
and many, many others.
The L.L. thing started out just as a coincidence -- Lois Lane was introduced, and Lex Luthor, and later Lana Lang. When the editors and writers noticed it, it started to become sort of a running gag -- Linda Lee, Lyra Lyroll, Lori Lemaris, Lucy Lane, and now even Lionel Luthor in Smallville
There you go.