| Laughlin | Laura | Laury | Lauth | Lavcock | Lavers | Lavie |
| Lavoie | Law | Lawhon | Lawler | Lawless | Lawrence | Laws |
| Lawson | Lay | Laycock | Layers | Layless | Layport | Layton |
| Leach | Leadwith | Leains | Leak | Leathlean | Leavine | Leavins |
| Lechlitner | Ledwith | Ledworth | Lee | Leffers | Leffingwell | LeFiles |
| LeFils | LeFlam | LeGardeur | Legg | Leggett | Legine | Legler |
| Leheridle | Leifeste | Leigh | Leighton | Leiht | Leiter | Leith |
| Leitner | Lelsey | Lemacks | Lemmons | Lenair | Lenard | Lene |
| Lengo | Lennard | Leo | Leonard | Leonardy | Leonie | LePage |
| Lerengo | Lesh | Lesley | Leslie | Leslie` | Lesly | Lessley |
| Lester | Letherman | Letterman | Levens | Lever | Leverett | Levin |
| Levinds | Leving | Levings | Levins | Levitt | Levy | Lewelling |
| Lewis | Ley | Lichty | Licklighter | Liddal | Liddall | Liddell |
| Lighsy | Lighte | Lightsey | Lihou | Lile | Liles | Lillington |
| Lilly | Limberg | Linair | Linberg | Lince | Lincoln | Lindey |
| Lindsay | Lindsey | Linebaugh | Linehan | Lingerfelt | Lingo | Link |
| Linkenhoker | Linquish | Linsholm | Linza | Lipes | Lipford | Lippincott |
| Lipscomb | Lipsey | Lister | Little | Lively | Livens | Livers |
| Livingston | Lloyd | Lochelaire | Lochlar | Lock | Locke | Lockett |
| Lockhart | Locklair | Locklar | Locklayar | Locklear | Lockler | Lockleyer |
| Locklier | Lockwood | Lockworth | Loften | Loftin | Lofton | Logan |
| Lokken | Loman | Lomans | Lomons | Long | Longmire | Longwell |
| Longworth | Lonso | Look | Loomis | Loose | Loper | Lopes |
| Lopez | Lorance | Lossen | Lott | Lough | Loury | Love |
| Lovejoy | Loveland | Lovell | Lovett | Low | Lowe | Lowman |
| Lowrey | Lowry | Lowther | Lowurry | Loyd | Lsley | Lucas |
| Luck | Luckey | Lucky | Ludolph | Luff | Luke | Lund |
| Lundbery | Lundquist | Lundy | Lungwell | Lunn | Luthor | Lutkins |
| Luttrell | Lutzow | Lybass | Lybrook | Lydia | Lyind | Lykes |
| Lymingston | Lynch | Lyne | Lynn | Lyon | Lyons | MacDonald |
| MacIntire | MacIntyre | Mack | MacKay | MacLean | MacLendon | MacMillan |
| MacPherson | MacReynolds | Macy | Maddox | Madelinne | Madison | Madre |
| Maechman | Magaha | Magbee | Mages | Maggard | Magill | Maguire |
| Mahaffey | Mahon | Main | Maine | Mainer | Majors | Maker |
| Maley | Malista | Mallory | Malmberg | Malone | Malong | Maloy |
| Mandly | Mandsley | Manes | Manley | Manly | Mann | Manner |
| Manning | Manns | Manrie | Mansel | Mansell | Mansfield | Mant |
| Manter | Manuel | Mapimo | Maquire | Maranda | Marander | Marceau |
| Marchman | Mariah | Marine | Marinell | Mark | Markette | Marlow |
| Marniell | Maroney | Marquis | Marr | Marsden | Marsh | Marshall |
| Marsille | Mart | Martenson | Martin | Martz | Marvin | Mary |
| Mashburn | Mason | Massey | Masters | Matair | Matchett | Mater |
| Matheny | Mathers | Mathes | Mathew | Mathews | Mathias | Mathis |
| Matias | Mattair | Matthew | Matthews | Matthis | Mattox | Mattscheck |
| Mauck | Maulden | Mauray, | Maurice | Maxwell | May | Mayers |
| Mayley | Maynard | Maynor | Mayo | Mays | Maywald | McAbe |
| McAbee | McAfee | McAlly | McAnley | McArthur | McArty | McAtherine |
| McAulay | McAuley | McAuly | McBean | McBride | mcc | McCall |
| McCallee | McCalpin | McCan | McCann | McCannon | McCants | McCardle |
| McCarlton | McCarroll | McCarty | McCarver | McCashey | McCasken | McCaskey |
| McCasley | McCatherine | McClain | McCleathen | McCleland | McClellan | McClelland |
| McClellen | McClenan | McClenand | McClenathan | McClenathon | McClendin | McClendon |
| McClenethan | McClenithan | McClenland | McClennan | McClenon | McClenton | McClinch |
| McCloud | McClung | McClure | McCoate | McColl | McCollough | McCombs |
| McConn | McConnell | McCook | McCormick | McCorquodale | McCoy | McCraig |
| McCranie | McCrary | McCray | McCrea | McCree | McCreight | McCullers |
| McCullou | McCullough | McCune | McCurdy | McDaniel | McDonald | McDonell |
| McDormant | McDougal | McDougle | McDounald | McDowell | McDuffee | McDuffie |
| McDugald | McDugold | McEachern | McEvans | McEver | McEwan | McEwen |
| McEwin | McEwing | McFail | McFarlan | McFarland | McFarlane | McFeely |
| McFell | McGee | McGehee | McGhin | McGibney | McGiver | McGlochlin |
| McGlouchlin | McGlown | McGowen | McGrath | McGraw | McGregor | McGriff |
| McGuire | McGuiver | McHardy | McHargue | McInnis | McIntosh | McIntyer |
| McIntyre | McIver | McKabe | McKade | McKain | McKarn | McKay |
| McKean | McKendree | McKenna | McKenney | McKennie | McKenny | McKenzie |
| McKinden | McKiney | McKinley | McKinney | McKinnon | McKinny | McKnab |