- La Cava
- Laba
- Labanc
- Labarbera
- Labarre
- Labate
- Labella
- Labertew
- Labishak
- Labobgah
- Laboon
- Labounsky
- Labounty
- Labriola
- Labritz
- Labye
- Labyoda
- Lacek
- Lachappell
- Lache
- Lacher
- Lachut
- Lacki
- Lackner
- Ladasky
- Ladebue
- Ladner
- Laface
- Lafaloni
- Lafferty
- Laffey
- Lafond
- Lafrankie
- Lafrenie
- Lagambo
- Lagenaur
- Lagnese
- Lagrotteria
- Lahey
- Lahoff
- Laird
- Lajohn
- Lakatosh
- Lalanne
- Lalonde
- Lam
- Lamagna
- Lamanna
- Lamantia
- Lamark
- Lamb
- Lambermont
- Lambert
- Lambie
- Lambria
- Lambrou
- Lamendola
- Lamenza
- Lamnick
- Lamond
- Lamonde
- Lamonna
- Lamont
- Lamoureaux
- Lampenfeld
- Lampus
- Lancaster
- Lancet
- Lancia
- Lancie
- Lancos
- Lancz-Kifer
- Land
- Landay
- Landis
- Landon
- Landram
- Landry
- Lane
- Lang
- Langan
- Lange
- Langer
- Langevin
- Langford
- Langhorst
- Langley
- Langue
- Langus
- Lanier
- Lanigan
- Lanke
- Lanni
- Lantz
- Lapeccerella
- Lapietra
- Lapinski
- Laplace
- Lapp
- Lappa
- Lapsley
- Laquatra
- Laquay
- Larbig
- Larcom
- Lardas
- Lardin
- Lardo
- Largent
- Larimer
- Larkin
- Larkins
- Larner
- Larocco
- Larson
- Larussa
- Lasagna
- Lasch
- Lascola
- Lash
- Lashely
- Lashua
- Laskey
- Lasko
- Laskowski
- Lasky
- Lasota
- Lasswell
- Lasto
- Lataille
- Latchford
- Latella
- Latimer
- Latkovich
- Latta
- Latterman
- Latusick
- Lau
- Lauda
- Laue
- Lauer
- Laughlin
- Laughner
- Laughran
- Laukaitis
- Laun
- Laurent
- Lauric
- Laury
- Lauso
- Lauterbach
- Lauth
- Lautman
- Lauver
- Lave
- Lavelle
- Lavender
- Lavery
- Lavie
- Lavrich
- Law
- Lawless
- Lawrence
- Lawry
- Lawryk
- Lawson
- Lawton
- Lay
- Layman
- Layne
- Lazar
- Lazarchik
- Lazaro
- Lazarus
- Lazor
- Lazzara
- Lazzaro
- Le
- Leabscher
- Leach
- Leacock
- Leahew
- Leahy
- Leana
- Lear
- Lease
- Leavey
- Leavitt
- Lebakken
- Lebau
- Lebeau
- Leber
- Lebish
- Lebovitz
- Lebow
- Lecce
- Lechard
- Lechner
- Leclaire
- Lecocq
- Leczek
- Leddon
- Ledergerber
- Lederman
- Ledonne
- Lee
- Leech
- Leedy
- Leeper
- Leers
- Leet
- Leete
- Lefchik
- Leff
- Legal
- Legath
- Leger
- Leggett
- Legler
- Lego
- Legrand
- Lehane
- Leheny
- Lehew
- Lehman
- Lehmeier
- Lehner
- Lehotsky
- Lehrman
- Leib
- Leibach
- Leibfreid
- Leibow
- Leiby
- Leidemann
- Leiden
- Leidigh
- Leiendecker
- Leighliter
- Leindecker
- Leinhardt
- Leininger
- Leinweber
- Leise
- Leisifer
- Leist
- Leister
- Leistner
- Leitsch
- Lejeune
- Lejpras
- Leksell
- Lelich
- Leman
- Lemanski
- Lemaster
- Lemesh
- Lemme
- Lemmon
- Lemon
- Lemone
- Lemper
- Lemster
- Lendl
- Lenenberg
- Leng
- Lengwin
- Lenigan
- Lenker
- Lenkiewicz
- Lenkner
- Lennartz
- Lennix
- Lennon
- Lennox
- Lenoski
- Lentini
- Lentz
- Lenz
- Lenzo
- Leo
- Leof
- Leonard
- Leonardi
- Leone
- Leong
- Leonhardt
- Leopold
- Lepidi
- Lepore
- Lepovsky
- Leppla
- Leptinsky
- Lerach
- Lerario
- Leroy
- Lersch
- Leschak
- Lescisin
- Lescroart
- Leseman
- Lesko
- Leskovic
- Lesky
- Lesniakowski
- Lesnieski
- Lesonick
- Lesoon
- Lesperance
- Lessa
- Lessman
- Lestan
- Lester
- Lestitian
- Lesutis
- Leszczewski
- Letender
- Letzkus
- Leuch
- Leung
- Levander
- Levarse
- Levaur
- Levenson
- Leventis
- Lever
- Levin
- Levine
- Levinson
- Levitske
- Levitt
- Levkulich
- Levosky
- Levy
- Lew
- Lewand
- Lewandowski
- Lewin
- Lewis
- Lewkowicz
- Lex
- Ley
- Leya
- Leyer
- Lherbier
- Li
- Liadis
- Liang
- Libbon
- Liberatore
- Liberi
- Libert
- Liberto
- Libman
- Lichiga
- Lichte
- Lichtenfels
- Lichtenstein
- Lieb
- Lieber
- Lieberman
- Liebler
- Liebman
- Light
- Lighthall
- Lightner
- Lijewski
- Liller
- Lillien
- Limauro
- Limbacher
- Limberiou
- Limegrover
- Lin
- Lincoln
- Lind
- Lindahl
- Lindblom
- Linden
- Lindenfelser
- Lindner
- Lindsay
- Lindsey
- Lindstrom
- Linduff
- Ling
- Linger
- Lingley
- Linhart
- Lining
- Lininger
- Link
- Linkes
- Linkosky
- Linn
- Linsenbigler
- Lintelman
- Linton
- Linzer
- Lio
- Liotta
- Lipay
- Lipinski
- Lipke
- Lipkin
- Lipner
- Lipp
- Lippert
- Lippiello
- Lipps
- Lipsitz
- Liptak
- Lis
- Lish
- Lisitsa
- Lisitsina
- Lisovich
- Lisowski
- Liss
- Lister
- Liston
- Litterine
- Litterini
- Little
- Littlefield
- Litton
- Litwin
- Litz
- Litzinger
- Liu
- Livengood
- Livesey
- Livingston
- Lizak
- Llinas
- Lloyd
- Lo
- Loadman
- Loar
- Lobbad
- Lobeck
- Lobel
- Lobello
- Lober
- Lobl
- Lobur
- Locaitis
- Locante
- Locastro
- Loch
- Locicero
- Lockard
- Locke
- Lockhart
- Lockley
- Lockwood
- Lococo
- Lodge
- Lodi
- Lodovico
- Loebig
- Loeffler
- Loehner
- Loehr
- Lofenfeld
- Lofink
- Loftus
- Logan
- Logeman
- Logue
- Lohman
- Lohner
- Lohr
- Lomack
- Lombardi
- Lombardo
- Lomire
- Lonabaugh
- Londino
- London
- Lone
- Long
- Longhenry
- Longo
- Looper
- Lopata
- Loper
- Lopez
- Lopinto
- Lopovich
- Lopresti
- Lord
- Lorence
- Lorenz
- Lorenzetti
- Loresch
- Lorey
- Loria
- Lorinc
- Lorinchak
- Loring
- Loritz
- Los
- Losagio
- Loshelder
- Lotito
- Lott
- Lotter
- Louden
- Louder
- Loughery
- Loughman
- Loughney
- Loughran
- Loughren
- Louis
- Lovasik
- Love
- Lovejoy
- Lovelace
- Lovely
- Lovett
- Lovit
- Low
- Lowden
- Lowe
- Lowenberg
- Lowenhaupt
- Lowenstein
- Lower
- Lowery
- Lowman
- Lowmaster
- Lowrey
- Lowrie
- Lowry
- Loy
- Lozano
- Lubarski
- Lubawy
- Lubbert
- Lubetsky
- Lubic
- Lubozynski
- Lucarelli
- Lucas
- Lucatorto
- Lucchetti
- Lucchino
- Lucente
- Luchin
- Luchini
- Lucht
- Lucis
- Luck
- Luckett
- Lucko
- Lucot
- Luczak
- Ludmann
- Ludwig
- Ludwin
- Luedde
- Luffe
- Luffy
- Luft
- Lugar
- Luiso
- Lukac
- Lukitsch
- Luksic
- Luksis
- Luley
- Lumsden
- Luncher
- Luncinski
- Lundy
- Lunnen
- Lunney
- Lunz
- Luoh
- Lupine
- Lupovitz
- Lusi
- Lusnak
- Luta
- Luterman
- Luther
- Lutter
- Luttinger
- Luttner
- Lutton
- Lutty
- Lutz
- Luu
- Lux
- Luxbacher
- Luxemburger
- Luzader
- Luzeiki
- Ly
- Lydiard
- Lydic
- Lydon
- Lyle
- Lynch
- Lynds
- Lyne
- Lynn
- Lynskey
- Lyon
- Lyons
- Lype
- Lysko
- Lytle