- Laake
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- Labyer
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- Ladislas
- Ladson
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- Laffey
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- Lake
- Laliberte
- Lalmansingh
- Lam
- Lamar
- Lamarco
- Lamb
- Lambert
- Lambright
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- Lampe
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- Lana
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- Lance
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- Laney
- Lang
- Lange
- Langenbach
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- Langmuir
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- Langton
- Lanier
- Lankenau
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- Lapp
- Laprade
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- Large
- Largent
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- Larocca
- Larochelle
- Larsen
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- Lawson
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- Layfield
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- Lee
- Leech
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- Lego
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- Leonard
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- Libby
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