- Labarre
- Labbitt
- Labelle
- Labey
- Labonne
- Labore
- Labossiere
- Labounty
- Labrant
- Labrash
- Labrasseur
- Lacasse
- Lacey
- Lach
- Lachapelle
- Lachappelle
- Lachenmayer
- Lacher
- Lachman
- Lachowitzer
- Lackas
- Lackey
- Lackner
- Laclair
- Lacroix
- Laden
- Ladig
- Ladoucer
- Ladouceur
- Ladoux
- Laduke
- Laemmle
- Lafave
- Lafavor
- Lafferty
- Lafleur
- Lafond
- Lafontaine
- Laforce
- Laforte
- Lager
- Lagerquist
- Lageson
- Lagos
- Lagus
- Lahaise
- Lahann
- Lahlum
- Lahr
- Lahtonen
- Lai
- Laible
- Lail
- Laine
- Lair
- Laird
- Laitinen
- Lake
- Lakhan
- Lakour
- Lakshina
- Lalla
- Lallier
- Lally
- Lam
- Laman
- Lamanna
- Lamb
- Lamberger
- Lambert
- Lambrecht
- Lamerand
- Lamere
- Lamers
- Lamke
- Lamkin
- Lammers
- Lamott
- Lamotte
- Lampe
- Lampert
- Lamphere
- Lampi
- Lampland
- Lamppa
- Lamprecht
- Lampright
- Lamprof
- Lamski
- Lamusga
- Lancaster
- Lance
- Lancette
- Lancman
- Lanctot
- Landa
- Landauer
- Lander
- Landers
- Landgrebe
- Landis
- Landkamer
- Landon
- Landreman
- Landretti
- Landsberger
- Landsverk
- Landucci
- Landy
- Lane
- Lang
- Langan
- Langanki
- Langdon
- Lange
- Langemo
- Langenberger
- Langenkamp
- Langer
- Langeslag
- Langeslay
- Langevin
- Langfield
- Langlie
- Langlois
- Langness
- Langsten
- Langston
- Langworthy
- Lanigan
- Lankey
- Lanman
- Lanners
- Lannier
- Lannon
- Lano
- Lanoux
- Lanphear
- Lans
- Lantz
- Lanyk
- Lanz
- Lao
- Lapadat
- Lapakko
- Lapalm
- Lape
- Lapierre
- Lapinski
- Laplante
- Lappen
- Laramy
- Lardy
- Lareau
- Larges
- Larkey
- Larkin
- Laroche
- Larock
- Larose
- Larranaga
- Larsen
- Larsin
- Larson
- Lartz
- Larue
- Laschansky
- Lascotte
- Laser
- Lash
- Lashomb
- Laska
- Laskowski
- Lasley
- Lassen
- Lastine
- Laszewski
- Lathrop
- Latimer
- Lattu
- Latuff
- Latulippe
- Laturneau
- Latvala
- Latvis
- Lau
- Laube
- Lauber
- Lauck
- Lauer
- Laughlin
- Laumakis
- Laumer
- Laumeyer
- Launer
- Lauria
- Lauring
- Laursen
- Lautt
- Lavalle
- Lavanway
- Lavell
- Laverdiere
- Laviano
- Lavick
- Lavigne
- Lavik
- Lavin
- Laviolette
- Lavold
- Lavorato
- Lavoy
- Law
- Lawhead
- Lawin
- Lawinger
- Lawler
- Lawless
- Lawrence
- Lawrenz
- Lawry
- Lawson
- Layer
- Lazarus
- Lazer
- Le
- Leach
- Leaf
- Leahy
- Lean
- Lear
- Learmann
- Learned
- Leary
- Leas
- Lease
- Leason
- Leatham
- Leatherman
- Leavitt
- Leba
- Lebakken
- Lebeau
- Lebens
- Leblanc
- Lebow
- Lebrun
- Lecher
- Leckenby
- Leclair
- Leclaire
- Ledbeter
- Ledding
- Ledman
- Ledo
- Leduc
- Lee
- Leebrick
- Leech
- Leeder
- Leedom
- Leegard
- Leeman
- Leerhoff
- Lefeber
- Lefebvre
- Lefevre
- Leforte
- Lefto
- Legendre
- Leggett
- Lehigh
- Lehman
- Lehmann
- Lehmkuhl
- Lehnen
- Lehner
- Leholm
- Lehse
- Lehto
- Leibel
- Leibl
- Leibold
- Leichter
- Leiding
- Leier
- Leif
- Leifeld
- Leiferman
- Leifheit
- Leigh
- Leight
- Leighton
- Leikikh
- Leimbach
- Lein
- Leinen
- Leingang
- Leininger
- Leino
- Leintz
- Leipold
- Leis
- Leistikow
- Leisz
- Leith
- Leitner
- Leivermann
- Leko
- Leland
- Leloup
- Lemanski
- Lemay
- Lembrich
- Lemcke
- Lemere
- Lemire
- Lemke
- Lemm
- Lemmer
- Lemmon
- Lemmons
- Lemoine
- Lemon
- Lempelius
- Lenart
- Lenarz
- Lencowski
- Lender
- Lendway
- Lenertz
- Lengfeld
- Lengsfeld
- Lengyel
- Lenius
- Lennartson
- Lennox
- Leno
- Lens
- Lensegrav
- Lent
- Lentfer
- Lenton
- Lentsch
- Lentz
- Lenz
- Lenzen
- Lenzmeier
- Leo
- Leon
- Leonard
- Leong
- Leonhart
- Leonidas
- Leopold
- Lepage
- Lepore
- Lepp
- Leppa
- Leppla
- Lepsche
- Lerach
- Lerbs
- Lerdahl
- Lerol
- Lerud
- Lervick
- Lesch
- Leschke
- Lesher
- Leske
- Leski
- Leslie
- Lesmeister
- Lesnar
- Lesnau
- Lesney
- Lessard
- Lessin
- Lessman
- Lester
- Lestina
- Letendre
- Lethert
- Letnes
- Letourneau
- Leu
- Leuer
- Leung
- Leutgeb
- Leuwer
- Lev
- Levasseur
- Levenson
- Leventhal
- Levercom
- Leverone
- Levers
- Leverton
- Leverty
- Levesseur
- Levin
- Levine
- Levinson
- Levitt
- Levitz
- Levoir
- Levy
- Lewandoski
- Lewandowski
- Lewis
- Lewison
- Lewnau
- Lewon
- Lewsader
- Ley
- Leyde
- Leyden
- Leyk
- Li
- Liang
- Libby
- Libera
- Liberato
- Liberko
- Liberman
- Liberty
- Libman
- Libra
- Lichtenberg
- Lichty
- Lick
- Lidberg
- Lidke
- Lidstad
- Lieb
- Liebelt
- Liebenow
- Liebig
- Lieder
- Liedholm
- Liedl
- Lief
- Liefert
- Lien
- Liend
- Liepa
- Liepolt
- Lietz
- Lievers
- Ligas
- Lightfoot
- Lightner
- Liike
- Liimatainen
- Liimatta
- Lijewski
- Likes
- Lilga
- Lilja
- Liljedahl
- Lillehaugen
- Lillemo
- Lilleodden
- Lillevold
- Lilli
- Lilliencrantz
- Lilligren
- Lillis
- Lilly
- Lilyquist
- Limback
- Limbert
- Lin
- Linander
- Linarte
- Lincoln
- Lind
- Linda
- Lindahl
- Lindall
- Lindauer
- Lindbeck
- Lindberg
- Lindblom
- Lindborg
- Lindeborg
- Lindeen
- Lindeke
- Lindell
- Lindelof
- Lindeman
- Lindenfelser
- Linder
- Lindesmith
- Lindfors
- Lindgren
- Lindh
- Lindholm
- Lindley
- Lindman
- Lindner
- Lindo
- Lindorff
- Lindow
- Lindquist
- Lindroos
- Lindrud
- Lindsay
- Lindsey
- Lindstedt
- Lindstrom
- Lindvall
- Lineer
- Linehan
- Linell
- Linert
- Ling
- Lingen
- Lingenfelter
- Lingofelt
- Link
- Linke
- Linkert
- Linn
- Linnan
- Linnard
- Linnell
- Linnerooth
- Linquist
- Linroth
- Linscheid
- Linse
- Linson
- Linster
- Linstrand
- Linstroth
- Linzie
- Lionetti
- Lipari
- Lipinski
- Lipke
- Lippert
- Lippitt
- Lippman
- Lipschultz
- Liptak
- Lipton
- Lischalk
- Liska
- Lislegard
- List
- Liston
- Litecky
- Literski
- Litkey
- Little
- Littlebird
- Littlefield
- Littler
- Litvinov
- Liu
- Livermore
- Livgard
- Livingston
- Ljung
- Llerandi
- Lloyd
- Lo
- Loats
- Loban
- Loberg
- Lobinsky
- Lobitz
- Lobner
- Lobovich
- Locascio
- Loch
- Lochner
- Lockbeam
- Locke
- Locken
- Lockery
- Lockhart
- Lockman
- Lockrem
- Lockridge
- Lockwood
- Locy
- Lodgaard
- Lodge
- Loe
- Loeding
- Loeffler
- Loegering
- Loehlein
- Loehr
- Loerzel
- Loes
- Loesch
- Loewen
- Loewenson
- Loff
- Lofgren
- Loftfield
- Loftsgaarden
- Loftsgard
- Loftus
- Logacz
- Logan
- Logelin
- Loger
- Logsdon
- Loh
- Loher
- Lohman
- Lohmann
- Lohr
- Lohse
- Loida
- Loken
- Lokken
- Lokowich
- Lombard
- Lommen
- London
- Lonetree
- Lonetti
- Loney
- Long
- Longbehn
- Longendyke
- Longfellow
- Longhurst
- Longley
- Longrie
- Longstreet
- Longwell
- Lonn
- Lonsky
- Loos
- Loots
- Lopez
- Lopresto
- Lor
- Loran
- Lorang
- Lorberbaum
- Lorentz
- Lorentzen
- Lorenz
- Lorenzi
- Lori
- Lorier
- Loris
- Lorr
- Lorrain
- Lortis
- Loscheider
- Loseth
- Losinski
- Losleben
- Losness
- Loth
- Lothrop
- Lotterman
- Lotzer
- Loucks
- Loudas
- Loughrey
- Louie
- Louis
- Loukas
- Lounsbury
- Loushin
- Love
- Lovejoy
- Lovelace
- Loveland
- Lovell
- Loveridge
- Loverso
- Lovick
- Lovo
- Lovstad
- Low
- Lowden
- Lowder
- Lowe
- Lowell
- Lowey
- Lowing
- Lowman
- Lowrey
- Lowry
- Lozneanu
- Lu
- Lubar
- Lubbers
- Lubet
- Lubov
- Lubrant
- Luby
- Lucas
- Lucci
- Luchsinger
- Lucht
- Luciana
- Luciani
- Lucio
- Lucius
- Luckes
- Luckfield
- Lucking
- Luczak
- Ludden
- Ludka
- Ludke
- Ludwig
- Lueben
- Luebker
- Lueck
- Luecke
- Lueder
- Luedke
- Luedtke
- Lueth
- Lufkin
- Luhmann
- Luinenburg
- Luk
- Luke
- Luken
- Lukin
- Lukoskie
- Lummis
- Lumpp
- Lumsden
- Lund
- Lunda
- Lundberg
- Lundblad
- Lundborg
- Lunde
- Lundeen
- Lundell
- Lundgaard
- Lundgren
- Lundholm
- Lundin
- Lundquist
- Lundsted
- Lundstrom
- Lundwall
- Lunn
- Lunzer
- Luoma
- Lupelow
- Lupie
- Lupo
- Lusk
- Lussky
- Lustig
- Lutgen
- Lutgens
- Luther
- Lutz
- Lux
- Luxem
- Luzaich
- Ly
- Lyden
- Lydon
- Lyford
- Lyke
- Lykke
- Lyksett
- Lyle
- Lyman
- Lynch
- Lyndes
- Lyne
- Lynn
- Lynum
- Lyon
- Lyons
- Lysholm
- Lystad
- Lystig
- Lyttle