- Labbe
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- Lamborn
- Landis
- Landry
- Lang
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- Langlois
- Lanier
- Lanker
- Lanski
- Lara
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- Laskey
- Laurence
- Lauricella
- Lavelle
- Law
- Lawrence
- Lawyer
- Lechuga
- Lee
- Lehmkuhl
- Lejeune
- Lemaire
- Lembke
- Leming
- Leonard
- Leslie
- Leung
- Levin
- Lewis
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- Linck
- Lisek
- Little
- Liu
- Livingstone
- Lockerman
- Lofton
- Logan
- Lombardo
- Lopez
- Lothar
- Louie
- Lownes
- Lowson
- Lozada
- Lu
- Lubanski
- Lukens
- Lumb
- Lust
- Lynch
- Lynn
- Lyons
- Lytras