| Lattimore (10,623) | Lau (52,266) | Lauer (37,830) |
| Laughlin (67,894) | Laura (12,076) | Laurence (34,443) |
| Laurent (14,458) | Laurie (14,725) | Laux (10,701) |
| Lavallee (9,916) | Lavelle (18,020) | Lavender (22,384) |
| Lavery (14,696) | Lavigne (17,455) | Lavin (22,467) |
| Lavine (11,823) | Lavoie (22,906) | Law (119,467) |
| Lawerence (11,083) | Lawhorn (14,538) | Lawler (64,579) |
| Lawless (34,530) | Lawlor (19,607) | Lawrence (515,245) |
| Laws (48,646) | Lawson (450,145) | Lawton (59,344) |
| Lawyer (11,829) | Lay (77,559) | Layman (39,381) |
| Layne (36,687) | Layton (92,795) | Lazar (12,046) |
| Lazaro (10,550) | Lazarus (13,540) | Lazo (16,932) |
| Lbrown (66,326) | Lea (39,313) | Leach (190,134) |
| Leahy (42,821) | Leak (17,489) | Leake (18,874) |
| Leal (66,770) | Lear (27,914) | Leary (100,117) |
| Lease (12,227) | Leasure (11,984) | Leatherman (16,976) |
| Leathers (16,063) | Leatherwood (10,911) | Leavitt (47,265) |
| Lebeau (10,106) | Leblanc (104,209) | Lebron (18,760) |
| Lechner (10,371) | Leclair (19,881) | Ledbetter (64,330) |
| Leddy (11,388) | Ledesma (32,365) | Ledezma (12,985) |
| Ledford (55,627) | Ledoux (13,127) | Lee (2,374,704) |
| Leech (25,586) | Leeds (13,258) | Leek (11,581) |
| Leeper (20,735) | Lees (22,343) | Lefebvre (12,243) |
| Lefever (12,193) | Lefevre (13,513) | Leffler (17,774) |
| Lefler (11,496) | Leftwich (10,583) | Leger (20,034) |
| Legg (39,486) | Leggett (39,772) | Legrand (11,885) |
| Lehman (122,590) | Lehmann (28,120) | Lehr (23,846) |
| Leigh (40,360) | Leighton (39,510) | Lein (10,962) |
| Leininger (10,567) | Leiva (11,782) | Leland (23,497) |
| Lemaster (18,674) | Lemay (22,335) | Lemieux (17,023) |
| Leming (11,571) | Lemke (31,022) | Lemley (13,724) |
| Lemmon (21,905) | Lemmons (12,468) | Lemoine (13,379) |
| Lemon (58,398) | Lemons (44,496) | Lemus (38,662) |
