- Labrie
- Lacasse
- Lachowicz
- Lackey
- Lacy
- Ladia
- Ladouceur
- Laduke
- Lafon
- Lam
- Lamanna
- Lambdon
- Lambert
- Lampros
- Lamson
- Lance
- Landers
- Landes
- Landis
- Lane
- Lanford
- Lang
- Lanham
- Lanier
- Lankford
- Lanter
- Lantz
- Lapish
- Laprad
- Laprade
- Largen
- Lark
- Larry
- Larsen
- Larson
- Lasky
- Lassak
- Latimer
- Lavender
- Lavinder
- Law
- Lawhorn
- Lawrence
- Lawson
- Lawton
- Laxton
- Lay
- Layfield
- Layman
- Layne
- Lazzuri
- Leach
- Leahy
- Leak
- Leake
- Lee
- Leech
- Leet
- Leffell
- Lefler
- Legard
- Legg
- Lehman
- Leigh
- Lemaire
- Lemmer
- Lemon
- Lemons
- Lennon
- Lenoir
- Leonard
- Lepeter
- Lester
- Level
- Levine
- Levy
- Lewis
- Liebl
- Liechty
- Light
- Likens
- Lilley
- Lilly
- Lindamood
- Lindsay
- Lindsey
- Lingenfelter
- Lingle
- Link
- Linkenhoker
- Linton
- Lippitt
- Litos
- Little
- Littlefield
- Locher
- Lockard
- Lockett
- Lockhart
- Locklear
- Loesel
- Loftis
- Logan
- Lombardo
- Long
- Lonitz
- Lopez
- Love
- Lovelace
- Loving
- Lowe
- Lucas
- Lucsko
- Ludwig
- Lukehart
- Lumpkin
- Lumsden
- Lunsford
- Lussen
- Lustig
- Lyle
- Lynch
- Lyon
- Lyons
- Lytton