- Loch
- Lochbaum
- Winifred (b. 27 Dec 1907, d. 10 Nov 1994)
- Locke
- Lockhart
- Locrinus King in Britain
- Lodbrock
- Loder
- Loftis
- Logan
- Logsdon
- Lohr
- Lohrer
- Lombards
- Lombardy
- Long
- Longbrake
- Longenecker
- Longespee
- Longstreet
- Loose
- Loosey
- Lorah
- Lord
- Loring
- Lorraine
- Losh
- Marion (b. 7 Feb 1840, d. 3 Aug 1914)
- Nancy N. (b. Mar 1844, d. 14 Aug 1912)
- Lott
- Lough
- ? (b. 1687, d. 30 Nov 1753)
- ? (b. abt 1724, d. 1818)
- Anna Catharine Barbara (b. 1742, d. 1812)
- Jacob Levi (b. 9 Sep 1760, d. 6 Oct 1833)
- Jacob Wesley (b. 5 Nov 1798, d. 18 Jan 1855)
- John Warner (b. 10 Apr 1786, d. 29 Jul 1875)
- Margaret Alsey, ("Allie") (b. 25 Dec 1832, d. 21 Mar 1926)
- Martha Amanda, ("Patty") (b. 23 Feb 1804, d. 8 Jun 1880)
- Matilda (b. Dec 1825, d. 8 Jan 1847)
- Nancy (b. 10 Jan 1789, d. 15 Apr 1863)
- Nancy (b. 20 Mar 1806, d. 2 Oct 1876)
- Nancy A. (b. abt 1835, d. 7 May 1926)
- Nancy Jane (b. 13 Oct 1765, d. 24 Mar 1855)
- Nancy Jane (b. abt 1837, d. bef 1857)
- Phoebe Catherine (b. 16 Feb 1827)
- Sarah Jane (b. 6 Jul 1829, d. 10 Dec 1915)
- Thomas Warner Jefferson (b. 12 Mar 1788, d. 13 Apr 1863)
- Loughran
- Louthe
- Louvain
- Lovaine
- Love
- Lovelace
- Loveland
- Lovin
- Hila (b. 7 Feb 1932, d. 18 Jun 2010)
- Low
- Lowden
- Lowe
- ? (b. abt 1694, d. abt 1775)
- Lower
- Lowery
- Lowrie
- Loyel
- Mary (b. 1 Apr 1724, d. Nov 1792)
- Lucado
- Lucar
- Lucas
- Lucerne
- Lucy
- Alice de (b. 1129, d. 1197)
- Alice de (b. abt 1207, d. bef 24 Mar 1288)
- Amabel de (b. aft 1200)
- Aveline de (b. abt 1122)
- Cecily de (b. abt 1168)
- Geoffrey de (b. abt 1120, d. bef 1179)
- Geoffrey de (b. abt 1162, d. 1234)
- Maud (Matilda) de (b. abt 1154)
- Maud de (b. abt 1128, d. aft 1163)
- Maud de (b. 1239, d. 1337)
- Reynold de (b. abt 1147, d. 11 Jan 1199)
- Richard "The Loyal" de (b. abt 1098, d. 14 Jul 1179)
- Richard de (b. abt 1180, d. 1213)
- Robert de (b. abt 1131)
- Roese de (b. abt 1148, d. aft 1225)
- William de (b. abt 1127)
- Ludwig
- Luibuirne
- Luire Prince of Ireland
- Lukecart
- Luker
- Lumpkin
- Luna
- Lung
- ? (b. 1711, d. 4 Apr 1759)
- Lurah
- Luscombe
- Lusignan
- Aenor de (b. abt 1125)
- Alice de (b. abt 1224, d. 9 Feb 1256)
- Alice de (b. abt 1243, d. 1290)
- Amaury de (b. abt 1143, d. 1 Apr 1205)
- Geoffrey de (b. abt 1150, d. 1224)
- Guy de (b. abt 1147, d. 1194)
- Hugh de (b. abt 1118, d. 11 Apr 1169)
- Hugh VII de (b. abt 1065, d. aft 2 Feb 1151)
- Hugh VIII-12 de (b. abt 1141, d. bef 11 Apr 1169)
- Mary de (b. abt 1220, d. 1252)
- Ponce de (b. abt 1115)
- Raoul (b. abt 1178, d. 1 May 1219)
- Lusignan X
- Hugh de (b. abt 1186, d. abt 6 Jun 1246)
- Lusignan XI
- Lusk
- Lutegareshale
- Piers de (b. abt 1134, d. aft 8 May 1198)
- Lutz
- Lyle
- Lyles
- Lynn
- Lyon
- Lyons
- Lytle
- Maasgau
- mac Aedh
- mac Aedh High King of Ireland
- mac Aedh Prince of Ulster
- mac Eochaid of the Nine Hostages
- mac Eoghan King of Aileach and Chief of Cinel Eoghan
- mac Fearghall
- mac Kenneth
- mac Mael High King of Ireland
- mac Mael Prince of Ulster and Chief of Cinel Eoghan
- Mac Muircheartach High King of Ireland
- mac Muiredach King of Connacht
- mac Mureadhach
- mac Niall
- mac Niall King of Aileach and Prince of Ulster
- mac Somerled
- MacAirt King of Ireland
- MacBranain
- macCairbre
- Mace
- MacElvain
- macEochach
- MacFergus
- MacGille
- Mack
- ? (b. 8 Aug 1943, d. 9 Aug 2013)
- macMurchada
- MacMurrough
- MacNeil
- MacNeill
- Mac'Neill
- MacNeill 2nd of Barra, 22nd of Mac
- MacNeill King of Aileach
- MacNeill Prince of Ulster and Tyrone
- Macon
- MacRory
- Angus (b. abt 1152, d. 1210)
- Macsen
- Macsen King of Demetia
- MacSomerled
- Madding
- Madigan
- Madog
- Madog King in Britain
- Magann
- Magers
- Magner
- Magoon
- Mahalaleel
- ? (b. 3609 BCE, d. 2714 BCE)
- Mahan
- Mahaney
- Mahon
- Maidlow
- Maine
- Mainer
- Mainz
- Majer
- Major
- Majors
- Malet
- Mallam
- Malloy
- Malmory
- Malone
- Maloney
- Maly
- Maminot
- Man
- Mandeville
- Mandrell
- Manecke
- Maner
- Mang
- Mankin
- Mann
- Manning
- Manson
- Maphis
- Marche
- Maredudd
- Madog ap (b. abt 1097, d. 6 FEB 1159/1160)
- Margery
- Maria Juliana
- Mariah
- Mariamme
- Marianne
- Marisco
- Joan de (b. abt 1202, d. bef 4 Sep 1225)
- Markley
- Anna E. (b. 7 Feb 1831, d. Nov 1859)
- David (b. abt 1806, d. 9 Feb 1880)
- Rebecca (b. 14 Jun 1811, d. 1888)
- Sarah M. (b. 25 Jun 1836, d. 23 Mar 1872)
- Marks
- Marquette
- Marrs
- Marsh
- Marshal
- Eve (b. abt 1205, d. bef 1246)
- Gilbert FitzRobert (b. abt 1067, d. bef 1130)
- Isabella (b. 9 Oct 1200, d. 15 Jan 1240)
- Johanna Joan (b. 1202, d. bef Nov 1234)
- John le (b. 1144, d. 1194)
- Maud (Matilda) (b. abt 1185, d. 27 Mar 1247)
- Sibyl (b. abt 1191, d. 27 Apr 1245)
- William, 4th Earl of Pembroke ("4th Earl of Pembroke") (b. 1146, d. 14 May 1219)
- William (b. abt 1190, d. 6 Apr 1231)
- Marshall
- Marsland
- Martel
- Martel King of Franks
- Martin
- ?
- Alice (b. 11 Feb 1773, d. 3 Feb 1843)
- Ann (b. 28 Jul 1795, d. Mar 1843)
- Barbara (d. 1782)
- Christian (b. 1730, d. 1808)
- Elizabeth J. (b. 1 Jun 1845, d. 24 Oct 1916)
- Henry (b. 22 Feb 1804, d. 2 Jul 1885)
- Jacob (b. 1690, d. 10 Oct 1775)
- John (b. 21 Jan 1767, d. 30 Sep 1824)
- Letha (b. 20 Dec 1905, d. 10 Oct 1998)
- Maria (b. 28 Mar 1863, d. 18 Apr 1938)
- Marie Frances (b. 28 Dec 1913, d. 20 Dec 2000)
- Mary (b. 1742, d. 1828)
- Martinez
- Martino I
- Martz
- Marvin
- Mason