- Labat
- Labrado
- Ladish
- Lambert
- Lamphear
- Lampkin
- Lane
- Lange
- Langford
- Lannon
- Larry
- Larson
- Lary
- Lashbrook
- Lasley
- Lauderdale
- Laundy
- Laws
- Lawson
- Lawton
- Lea
- Lechliter
- Lee
- Lehn
- Lehnen
- Leihsing
- Leiker
- Lemons
- Leon
- Leonard
- Leroy
- Letcher
- Letellier
- Letts
- Lewis
- Lichtenberger
- Lin
- Lindberg
- Lindesay
- Lindsay
- Lindsey
- Lipovitz
- Liston
- Little
- Littlejohn
- Livengood
- Livingston
- Locke
- Long
- Longabach
- Longdon
- Longoria
- Longstaff
- Lopez
- Loun
- Lowry
- Loya
- Lucas
- Lucke
- Lust
- Lyon
- Lyons