- Labelle
- Lachowski
- Lacy
- Laffoon
- Lage
- Lamb
- Lambert
- Lambiotte
- Lamm
- Lancaster
- Lane
- Lange
- Langford
- Langhorne
- Langley
- Langry-Green
- Langston
- Lanier
- Lankford
- Lanoir
- Lantz
- Lanzarone
- Larkin
- Larkins
- Larmee
- Larmore
- Larsen
- Larus
- Lassiter
- Latane
- Latham
- Latimer
- Latney
- Lattuada
- Laughlin
- Lavecchia
- Lavine
- Law
- Lawrence
- Lawson
- Layne
- Le
- Leak
- Leake
- Leary
- Leathers
- Lebey
- Leckey
- Ledjenac
- Lee
- Leeper
- Lees
- Leeth
- Legnaioli
- Leith
- Lemmond
- Lemons
- Lennox
- Lenzi
- Leon
- Leonard
- Lerner
- Lester
- Levenberg
- Levien
- Levin
- Levins
- Lewis
- Leys
- Liberty
- Lidman
- Lieng
- Liepis
- Liggons
- Ligh
- Light
- Lightfoot
- Lindberg
- Lindsey
- Linen
- Link
- Linkous
- Lipe
- Lipper
- Lipscomb
- Lisk
- Lissenden
- Little
- Lively
- Lloyd
- Locklear
- Loehr
- Loftis
- Loftus
- Lomarrow
- London
- Lonergan
- Long
- Longest
- Looney
- Lopez
- Lord
- Lormand
- Loth
- Lott
- Louderback
- Loudermilk
- Loughran
- Love
- Loving
- Lowe
- Lowry
- Loyde
- Lucia
- Luck
- Luckey
- Lucord
- Ludwig
- Luebke
- Luke
- Lukhard
- Lundy
- Luther
- Luxmoore
- Lydiard
- Lyell
- Lyles
- Lynch
- Lynde
- Lynn
- Lyons
- Lytle