- Lackey
- Lackman
- Lafollette
- Lafore
- Lakes
- Lancaster
- Land
- Landis
- Landucci
- Lane
- Langston
- Larson
- Latta
- Laughlin
- Laughman
- Lawrence
- Lawson
- Lay
- Leach
- Leary
- Lebron
- Lechtreck
- Lecrone
- Lee
- Leheny
- Lehmkuhl
- Lemucchi
- Lenander
- Lencioni
- Lenhard
- Leong
- Leopold
- Lesnak
- Lewis
- Liascos
- Licastro
- Ligari
- Limi
- Linder
- Lindgren
- Linenberger
- Lisenbee
- Litke
- Lockey
- Lodien
- Loeffel
- Loflin
- Lomeli
- Long
- Longacre
- Loos
- Lopez
- Lortscher
- Lostaunau
- Loubey
- Loven
- Lovett
- Lowder
- Lowe
- Lowell
- Lucas
- Lundquist
- Lundy
- Lusby
- Lutes
- Luther
- Lyons