- Lacey
- Lackner
- Lage
- Lagios
- Laidley
- Lam
- Lambert
- Lambly
- Lane
- Lang
- Langert
- Langlois
- Lao
- Lapagla
- Lara
- Laratta
- Larsen
- Larson
- Lasher
- Laskowsky
- Lass
- Lasseter
- Lathan
- Lau
- Lavelle
- Law
- Lawler
- Lawrence
- Lawshe
- Lawson
- Laxo
- Layne
- Le
- Leal
- Lecumberry
- Lee
- Leefer
- Lefkowitz
- Leftridge
- Lehmkuhl
- Lei
- Leighton
- Leimbach
- Lemos
- Lemus
- Leonard
- Leong
- Leoni
- Leroe
- Lesko
- Leto
- Lettis
- Leung
- Levi
- Levine
- Levy
- Lew
- Lewis
- Lezotte
- Li
- Lieberman
- Lieras
- Lieu
- Lim
- Limosner
- Limtrakool
- Lin
- Lind
- Lindsay
- Lindstrom
- Linero
- Linford
- Linssen
- Lipkin
- Lisanti
- Liserra
- Lisnock
- Litsas
- Liu
- Livingston
- Lo
- Logan
- Lohden
- Lok
- Lollis
- Lomax
- London
- Long
- Loo
- Look
- Lopez
- Lore
- Louden
- Lovato
- Lovelace
- Lovi
- Lowe
- Lu
- Lubin
- Ludwick
- Lui
- Luibrand
- Lund
- Luo
- Luong
- Luster
- Luu
- Luyen
- Ly
- Lydon
- Lynch