- Labak
- Lacey
- Lacy
- Lademan
- Ladouceur
- Laichalk
- Lake
- Lamar
- Lambert
- Lancaster
- Landrum
- Lane
- Lang
- Lange
- Langford
- Lapalme
- Larkin
- Larkins
- Larson
- Laskey
- Latimer
- Latta
- Laudazio
- Laury
- Laux
- Lavender
- Lawhorn
- Lawnicki
- Lawrence
- Laws
- Lawson
- Layton
- Lazzana
- Leake
- Leamon
- Leaphart
- Leavey
- Ledesma
- Lee
- Leeth
- Leflore
- Leggett
- Leidlein
- Leland
- Lemieux
- Lemmon
- Lenart
- Lenear
- Lengel
- Lenicki
- Leniear
- Lenox
- Leon
- Leonard
- Lester
- Lett
- Letzmann
- Leung
- Leverett
- Levesque
- Lewis
- Liagkos
- Licorish
- Liddell
- Liddle
- Liggins
- Lightsey
- Lillard
- Lillian
- Lillie
- Lindsey
- Linticome
- Lipscomb
- Lister
- Little
- Littlejohn
- Littles
- Littleton
- Littsey
- Lizon
- Lloyd
- Locke
- Lockett
- Lockhart
- Lockridge
- Lofton
- Logan
- Lojek
- Lomeli
- Long
- Longest
- Longino
- Longmire
- Longstreet
- Looney
- Loper
- Lopez
- Lous
- Love
- Lovelace
- Lowe
- Lowe-Anderson
- Lowery
- Lozano
- Lucas
- Luckett
- Lucy
- Luevanos
- Luke
- Lumbard
- Lumpkin
- Lundy
- Lusk
- Lyes
- Lygizos
- Lynch
- Lynem
- Lyons
- Lytle