- Lattin
- Latting
- Latturner
- Lau
- Laudon
- Lauer
- Laughlin
- Launce
- Launder
- Laurnel
- Lausen
- Lausten
- Lavell
- Lavery
- LaVilla
- Lavorgna
- Law
- Lawall
- Lawless
- Lawrence
- Lawrenson
- Lawson
- Lawton
- Lawver
- Lay
- Laymance
- Layne
- Lazell
- le Bon
- le Botiler
- le Child
- Le Deuf
- le Gros
- Le Hew
- Le Hunt
- le Marshal
- Alice (Abt 1215-Aft 1270)
- le Meschin
- Le Pera
- le Poer
- le Porter
- le Poure
- Le Roux
- le Sore
- le Strange
- Leach
- Leader
- Leal
- Learn
- Learnard
- Learned
- Leate
- Leathersich
- Leavenworth
- Leavitt
- Leber
- LeBlanc
- Lebsack
- Leclaire
- LeCoque
- Ledbetter
- Lee
- Leech
- Leeds
- Leek
- Leekha
- Leeman
- Leeper
- Leete
- LeFavere
- Lefevre
- Leffingwell
- Leffinwell
- Leflang
- Legard
- Legate
- Legault
- Leger
- Legg
- Leggett