- Labby
- Laberge
- Labrousse
- Labudda
- Lacey
- Lacheck
- Lacher
- Laden
- Ladouceur
- Ladue
- Lae
- Laetsch
- Lafaive
- Lafave
- Laferte
- Lafollette
- Lafrenz
- Lagrande
- Lahart
- Lahav
- Lahodny
- Laidler
- Laird
- Lairson
- Lajoy
- Lake
- Lakomecki
- Lall
- Lam
- Lamarche
- Lamb
- Lambert
- Lamberth
- Lambo
- Lamer
- Lammers
- Lammert
- Lamoreaux
- Lamorticella
- Lamothe
- Lamp
- Lampe
- Lampert
- Lampi
- Lampsa
- Lampus
- Lamvik
- Landa
- Landauer
- Landeen
- Landenberger
- Landgraver
- Landgrebe
- Landis
- Landon
- Landry
- Lane
- Langdon
- Lange
- Langevin
- Langfus
- Langley
- Langslet
- Langston
- Lannigan
- Lanoff
- Lansford
- Lantz
- Lanyon
- Lape
- Laplante
- Lapp
- Laptook
- Laraia
- Large
- Larguier
- Larisch
- Lariviere
- Larkin
- Larpenteur
- Larrain
- Larrance
- Larry
- Larsen
- Larson
- Larue
- Larvik
- Lash
- Laskey
- Lasley
- Laslie
- Lassahn
- Laszlo
- Latta
- Lauchuc
- Lauder
- Laufe
- Laufenberg
- Laughlin
- Lauinger
- Laurer
- Lauten
- Lauter
- Laveille
- Lavey
- Lavine
- Lavoie
- Law
- Lawpaugh
- Lawr
- Lawrence
- Lawrentz
- Lawson
- Lawton
- Lazrine
- Le
- Le Chau
- Le Master
- Leach
- Leahy
- Leatham
- Leatherwood
- Leavens
- Leavenworth
- Leback
- Lebrun
- Lebsack
- Lebus
- Lechance
- Lechner
- Ledbetter
- Leder
- Lederer
- Lee
- Leeb
- Leech
- Leedy
- Leehan
- Leek
- Leeper
- Leeson
- Lefebvre
- Leffall
- Lefors
- Legarde
- Leger
- Leggett
- Legler
- Legrand
- Lehecka
- Lehl
- Lehman
- Lehr
- Lehto
- Lei
- Leibham
- Leider
- Leigh
- Leighton
- Leinberger
- Leistra
- Leith
- Leitz
- Lekas
- Leland
- Lemke
- Lenc
- Lendya
- Lenio
- Lennertz
- Lenox
- Lenth
- Lentz
- Lenzen
- Lenzi
- Lenzini
- Leon
- Leonard
- Leonchik
- Leonhardt
- Leontyev
- Lepley
- Lepper
- Leptich
- Lerch
- Lerner
- Lesage
- Leschber
- Lesher
- Leslie
- Lessard
- Lester
- Letang
- Lethe
- Lett
- Lettow
- Leung
- Lev
- Levalley
- Levan
- Lever
- Leverenz
- Levering
- Levers
- Leverton
- Levi
- Levich
- Levine
- Levy
- Lew
- Lewin
- Lewis
- Lewitz
- Leykin
- Li
- Liang
- Liao
- Liavaris
- Libby
- Libke
- Liday
- Lieb
- Liebe
- Liebel
- Lieberman
- Liebert
- Liebertz
- Liebswager
- Lienhard
- Lienhart
- Lieu
- Lifton
- Lightcap
- Lightfoot
- Ligman
- Lillegard
- Lilley
- Lilly
- Lim
- Limbaugh
- Limbocker
- Lin
- Linchuk
- Lincoln
- Lind
- Lindahl
- Lindberg
- Linde
- Lindeman
- Lindenthal
- Linder
- Linderman
- Lindgren
- Lindholm
- Lindquist
- Lindsey
- Lindstrom
- Linkous
- Linman
- Linn
- Linneball
- Linnebur
- Linton
- Linville
- Lions
- Lipinsky
- Lipman
- Lipscomb
- Lipsitz
- Lipski
- Liskear
- Lisle
- Litinetsky
- Litofe
- Litowinsky
- Litster
- Little
- Littlefield
- Littlepage
- Littlewood
- Litz
- Liu
- Livingston
- Lizundia
- Llewellyn
- Lloyd
- Lo
- Lobbato
- Locke
- Lockhart
- Lodine
- Loe
- Loeb
- Loebner
- Loeck
- Loen
- Loennig
- Lofthouse
- Lofting
- Logan
- Logue
- Lohkamp
- Lohmann
- Lokting
- Lomax
- Lombard
- Lommen
- Lomonaco
- Londahl
- London
- Loney
- Long
- Longfellow
- Loo
- Loofburrow
- Looi
- Loomis
- Loose
- Lopas
- Loper
- Lopez
- Loprinzi
- Lord
- Lorenson
- Lorenzen
- Lorenzo
- Lorinz
- Loschiavo
- Loske
- Lothian
- Lothman
- Lott
- Lottridge
- Loucks
- Loughran
- Louie
- Loukes
- Lounsbery
- Love
- Loveland
- Lovett
- Lovre
- Low
- Lowe
- Lowell
- Lowes
- Lowman
- Lown
- Lowry
- Loyning
- Lozier
- Lozovoy
- Lubitz
- Lubomudrov
- Luc
- Lucas
- Luce
- Lucey
- Lucht
- Luck
- Luckenbaugh
- Luckert
- Ludlow
- Ludlum
- Ludwick
- Ludwig
- Ludwigsen
- Luebbe
- Luening
- Luersen
- Luethe
- Luettgerodt
- Luey
- Luft
- Lujano
- Luke
- Luksan
- Lulay
- Lum
- Lund
- Lunda
- Lundell
- Lundgren
- Lundquist
- Lundy
- Lungu
- Lunsford
- Luong
- Lupei
- Lupeiu
- Lupenko
- Lupu-Vierv
- Luqman
- Luscher
- Lusk
- Lusky
- Lussier
- Lutje
- Lutz
- Luu
- Luza
- Ly
- Lyford
- Lyle
- Lyles
- Lyman
- Lynard
- Lynch
- Lynn
- Lyon
- Lyons
- Lyski
- Lyttle