- Laaker
- Labarbera
- Labarge
- Labeau
- Labeaume
- Labelle
- Labit
- Labitska
- Labonte
- Labore
- Laboube
- Labrier
- Lacey
- Lach
- Lachajczyk
- Lackey
- Lackland
- Lacks
- Lacroix
- Lacy
- Lada
- Ladd
- Ladendecker
- Laderman
- Ladinsky
- Ladriere
- Lafata
- Lafentres
- Lafever
- Lafferty
- Lafiore
- Laflamme
- Laforce
- Lafoy
- Lafranchi
- Lafser
- Lagermann
- Lagershausen
- Lagos
- Lagrange
- Lagrone
- Lahm
- Lahman
- Lahue
- Laing
- Lains
- Laird
- Laitman
- Lake
- Lakebrink
- Lakeman
- Lakey
- Lala
- Lally
- Lalumandiere
- Lam
- Lamacchia
- Lamarche
- Lamartina
- Lamatina
- Lamb
- Lambert
- Lambing
- Lambrich
- Lamburt
- Lamburth
- Lamkin
- Lammert
- Lamonica
- Lamons
- Lamoreux
- Lamotte
- Lamp
- Lampasi
- Lampe
- Lampen
- Lamprecht
- Lampson
- Lancaster
- Lance
- Land
- Landa
- Landau
- Landauer
- Lander
- Landers
- Landes
- Landgraf
- Landgrebe
- Landig
- Landis
- Landiss
- Landmann
- Landon
- Landreth
- Landrum
- Landry
- Landsbaum
- Landwehr
- Lane
- Lang
- Langa
- Langan
- Langbein
- Langbord
- Lange
- Langenbacher
- Langenberg
- Langendoerfer
- Langeneckert
- Langenfeld
- Langford
- Langhammer
- Langholz
- Langley
- Langsam
- Langsdorf
- Langston
- Lanigan
- Laningham
- Lanis
- Lankford
- Lankheit
- Lanns
- Lanser
- Lansing
- Lanson
- Lanter
- Lantos
- Lanzafame
- Lapides
- Lapin
- Laplant
- Laplante
- Laposa
- Lapp
- Lapree
- Larcom
- Lard
- Large
- Larm
- Larocca
- Larochelle
- Larosa
- Larose
- Larowe
- Larsen
- Larson
- Larue
- Lasater
- Laschober
- Lascola
- Lashley
- Laski
- Laskowski
- Lasky
- Laslo
- Last
- Latal
- Lathim
- Lathon
- Lathrop
- Latic
- Latimore
- Latino
- Lato
- Latson
- Latt
- Lattanzi
- Lattimore
- Latty
- Latuda
- Laturno
- Latzer
- Lau
- Laub
- Laube
- Lauber
- Laucis
- Laudel
- Lauer
- Laufer
- Lauff
- Laughlin
- Lauman
- Launius
- Laurenti
- Lauricella
- Laury
- Lause
- Lausevich
- Laususe
- Laut
- Lautner
- Lavazzi
- Laventure
- Lavi
- Lavigne
- Lavin
- Lawhon
- Lawhorn
- Lawler
- Lawless
- Lawlor
- Lawrence
- Lawson
- Lawter
- Lawton
- Lawyer
- Laxton
- Lay
- Layne
- Layton
- Lazare
- Lazaroff
- Lazarski
- Lazarus
- Lazarz
- Lazerwitz
- Lazier
- Lazzareschi
- Leabig
- Leach
- Leady
- Leahart
- Leahy
- Leake
- Leaks
- Leary
- Leathers
- Leavey
- Lebaube
- Lebbing
- Lebegue
- Lebic
- Lebsock
- Lechner
- Lecko
- Lecrone
- Lecuyer
- Ledbetter
- Ledesma
- Ledwidge
- Lee
- Leeker
- Leeman
- Leemann
- Leesmann
- Lefarth
- Lefebvre
- Lefler
- Lefort
- Lefton
- Legaspi
- Leggitt
- Legrand
- Lehman
- Lehmann
- Lehmkuhl
- Lehmuth
- Lehnert
- Lehr
- Lehrer
- Leibach
- Leiber
- Leibu
- Leicht
- Leiendecker
- Leigh
- Leight
- Leighton
- Leimbach
- Leinauer
- Leindecker
- Leinicke
- Leininger
- Leise
- Leith
- Leitner
- Lekaneyentumi
- Leland
- Lemakis
- Lemay
- Lemen
- Lemery
- Leming
- Lemley
- Lemmer
- Lemon
- Lemp
- Lenau
- Lenceski
- Lencz
- Lengenfelder
- Lenger
- Lenhart
- Lenk
- Lenke
- Lentes
- Lents
- Lenz
- Lenzen
- Leonard
- Leone
- Leong
- Leopold
- Lepp
- Lepper
- Lerbs
- Lerch
- Leritz
- Lesch
- Leslie
- Lesmeister
- Lesser
- Lester
- Lestman
- Lestmann
- Letz
- Leuthen
- Leve
- Level
- Levels
- Leventhal
- Leveque
- Leverenz
- Leverich
- Levett
- Levey
- Levin
- Levine
- Levinson
- Levis
- Levtnkov
- Levvintre
- Levy
- Lewandowski
- Lewey
- Lewin
- Lewis
- Ley
- Leyton
- Liapis
- Libanoff
- Libby
- Liberman
- Librach
- Licari
- Licata
- Licavoli
- Lichtenfeld
- Lieb
- Lieber
- Lieberman
- Lieberoff
- Liebman
- Liebsch
- Liermann
- Liess
- Light
- Lightfoot
- Lightner
- Ligon
- Ligue
- Likes
- Liles
- Lilienkamp
- Liliensiek
- Lilmars
- Limberg
- Limekeyler
- Limmer
- Lin
- Linberg
- Linck
- Lincoln
- Lind
- Lindberg
- Lindecke
- Lindemann
- Lindenberg
- Linder
- Linders
- Lindley
- Lindsay
- Lindsey
- Lindsley
- Linebach
- Lineberger
- Linehan
- Linenbroker
- Ling
- Lingle
- Linhorst
- Link
- Linke
- Linn
- Linneman
- Linomaz
- Linsenman
- Linton
- Lintz
- Linville
- Liontos
- Liou
- Lipel
- Lipic
- Lipinski
- Lipman-Finn
- Lipovac
- Lippert
- Lippold
- Lipsinsky
- Lipton
- Lischer
- Lissant
- Listerman
- Litteken
- Littich
- Little
- Littlefield
- Littleton
- Litwack
- Litwak
- Litz
- Litzinger
- Litzsinger
- Liuzza
- Livers
- Livingston
- Lloyd
- Llyod
- Lobdell
- Locher
- Lochhead
- Lochmann
- Lock
- Locke
- Lockett
- Lockhart
- Locklear
- Lockyear
- Lococo
- Lodato
- Lodes
- Lodewyck
- Loeb
- Loebner
- Loebs
- Loeffelman
- Loeffler
- Loehr
- Loesch
- Loesing
- Loevy
- Lofstedt
- Lofties
- Loftus
- Logan
- Lograsso
- Logue
- Loher
- Lohman
- Lohmann
- Lohnes
- Lohse
- Lohuis
- Lomax
- Lonati
- Loncaric
- Lonergan
- Lonero
- Long
- Longinette
- Longland
- Longo
- Longolius
- Longoni
- Longshaw
- Lonigro
- Loo
- Loock
- Loomis
- Looney
- Loos
- Loosmore
- Lopata
- Lopate
- Loper
- Lopez
- Lopinot
- Loranger
- Lord
- Lore
- Lorenscheit
- Lorenz
- Lorenzini
- Lorino
- Loris
- Lorusso
- Losos
- Lossos
- Loste
- Lott
- Lottmann
- Lotts
- Loudenback
- Loudermilk
- Lough
- Louis
- Lousis
- Lovato
- Love
- Loveall
- Lovelace
- Loveland
- Loveless
- Lovell
- Lovett
- Loving
- Lovins
- Lowe
- Lowell
- Lowenhaupt
- Lowery
- Lowrey
- Lowry
- Lowther
- Loy
- Loyd
- Lozina
- Lu
- Lubeley
- Luber
- Luberda
- Lubovich
- Lucas
- Lucken
- Luckett
- Lucy
- Luczak
- Ludbrook
- Ludwig
- Luebbers
- Luebbert
- Luebke
- Luebkert
- Luechtefeld
- Lueck
- Luecke
- Lueckenhoff
- Luedde
- Lueg
- Lueken
- Lueker
- Luepker
- Luetje
- Luetkemeyer
- Luft
- Luis
- Luisetti
- Lukasiewicz
- Luke
- Lumetta
- Lumpe
- Lumpkin
- Lund
- Lundgren
- Lundstrom
- Lungo
- Lunnie
- Luntzer
- Luong
- Lupo
- Lurk
- Lurkins
- Lusczek
- Luster
- Lustgarten
- Luth
- Luther
- Lutker
- Lutkewitte
- Luttrell
- Lutz
- Lutz-Dreyer
- Lutzeler
- Lux
- Luzecky
- Ly
- Lycan
- Lycke
- Lydon
- Lyles
- Lynam
- Lynas
- Lynch
- Lynum
- Lyon
- Lyons
- Lyss
- Lytle
- Lyubovich