I met a woman called Lyndall once, it was originally boys but now unisex apparently. Other than that, I can only really think of nice ones that are male/female variations...
Laurie as nn for Laura/Laurence
Leo as nn for Leon/Leonora
Lorne/Lorna
Lucian/Lucienne
Louis/Louise/a
Luca and Liv I think might have passed as unisex a couple years back but now pretty established as male/female. Lindsay/Lindsey is but mostly girls these days, and Lesley/ie is just grim..