- MacAlister (2)
- MacAlpin
- Official listing of members supporting the re-establishment of the Clan. - MacArthur
- Family trees submitted by researchers from all over the Western World. The objective is to unite all branches of the clan. - MacBean
 - MacCallum/Malcolm Society
 - MacDermot
- Clan association site with event listings, historical information, guest book, and more. - MacDonald (3)
- MacDougall Society
 - MacEachain / McKaughan / McCoin
- Family genealogy from 247 AD, with over 25 spellings of extended family. Includes over 600 pages from a book by Minniebell McKaughan Perkins. - MacFarlane
- For all MacFarlanes of whatever spelling, associated families, and descendants of the clan. Suas leis 'a chlann 'ic Pharlain! - MacGillivray
- Including the alternate spellings: McGillivray, McGillivary, MacGillvrey, McGilvra, McGillvra, MacGilvery, McGilvery. - MacIntyre (1)
- MacKay (2)
- Mackenstedt / Runde / Peetz
- Genealogy and ancestry of the families. MacKenzie
- Of the Isle of Lewis. Documents Donald MacKenzie's direct family line over 200 years.- MacKenzie / McKenzie
- Researching Alexander McKenzie from Port Henry, New York (approx. 1750); other surnames include Breese, Teeter, and Towner. - MacKinnon (1)
- MacKinnon / Jackson
- Features the MacKinnon/McKinnon and Jackson/Jacklin genealogy. - Mackintosh (2)
- MacLachlan (3)
- Maclaine (1)
- MacLeod (2)
MacLochlainn / McLaughlin
- Of Inishowen.- MacNab (2)
- MacNeil (3)
- MacNicol (1)
- Macrae
- Clan history and family genealogy with searchable database, and related Scottish history, culture, and current events links. - Madaris
- Genealogy from 1600 - 1920, including alternate spellings: Medearis, Medaris, McDaris and McDearis. - Majercin / Majerchin / Mayerchin / Myerchin
- Documenting family in Illinois and Slovakia. Also includes Clemente, Pacheco, Kacmar, Paquette, Arasimowicz, Dundon, and Caravalho information. - Mallandaine
- History of the family from 1670 to the present day. - Malo
- Dedicated to the worldwide Malo family, including community, history, and directory. - Malone (1)
- Maloof
 - Maltpress
- Offers family history for the surname Malpass, Mallpress, and Maltpress. - Mann
- Genealogy of Nancy Mann Davis and her families from VA, NC, SC, GA, AL, and MS, including the surnames of Mann, Martin, Rodgers, Wells, and Oliver. - Manning
- Of Elmira, NY: James and Honora (Noonan) Manning of Ireland to Hartford County, CT to Elmira, NY. - Mansker
- Hyperlinked resource for researchers into the Mansker and Minsker families. - Mansur
- Covers the history of the Wisconsin-based Mansur family. - Marble
- Including the surnames: Boon, Carver, Downs, Knapp, Landers, Marble, Rinehart, Roberts, Sadler, Stapp, Turner and Webb. - Marinaccio
- Easy-to-read look at my ancestors. With digitally restored photos. - Markham
- Family genealogy of Thomas Markham Sr. of England, who came to Virginia in the 1600s. - Maro
 - Marple
- Includes an index of the Marple and Hart families, oral history, and publications. Marrian
- Family information by surname, pedigree, or descendants.- Martin (1)
- Martz
 - Masek
- Research dating back to 1865. - Massey
- Other names include: Lewis, Adams, Pulitano, McBride, Rogers, and more. - Masters (3)
- Mastin
 - Matheson
 - Matthews (1)
- Maxfield
- Information about the descendants of William Maxfield and other Maxfields interested in family history. - Maxwell (1)
- Mayrand
 - McAfee (2)
- McAteer
- Irish Clan. Includes the Mateers, McTeers and Meteers. - McBee
- Other surnames include: Bauer, Branson, Billington, Hagemeier, Rinkel, Schulenberg, and Beasley. - McCaffrey / McCorkle / Woody
- Descendants of many early Virginia, North Carolina, West Virginia, Kentucky & Ohio families. McCandless
- Includes births, deaths, marriages, and church records.- McCartney
- Including vital statistics, name origins, and census returns. - McChesney
- Other surnames include: Allen, Cartwright, Cross, Garner, Grantham, Griffith, Hill, Humphreys, Keith, Mattison, Phillips, Russell, Snelson. - McClintock
- Collection of genealogies submitted by fellow researches. - McCloud / McLeod
- Also including the surnames: MacLoud, Mosier, Moser, Mosher, Musser and various other spellings. Queries, census, burial, Biographical sketches and photos. - McConathy
- Genealogical research for the surname. - McConnell
- Especially McConnells in Ohio. - McConville
- Features historical information about the McConville family and Irish genealogy in general. Also covers traditional music and Irish Sessions in Chicago. - McCord (1)
- McCoy (2)
- McDonald Family Genealogy
- McDonald family genealogy website with photos, surnames, histories, documents, family tree, and more. - McElhinney
- Genealogical research on the surname. - McFarrin/McFerrin
- Surnames include McFerrin, McFarrin, Watson, Currier, Geng, Penn, and Stein. - McGee / Chaney
- Other surnames include Hobbs, Hunt, and Overman. - McGough
- Includes information about the origins of the family in Ireland and familes in the United States and Canada. - McGovern
- Genealogy, history, news, chat, and fun. - McGuire (1)
- McIlvains
- Descendants of early colonist Andrew McIlvain. - McKinnon
- Story of descendants of Niel and Flora MacKinnon from Tiree, Scotland to Bruce County, Ontario. - McKusick
- History of the association, its membership, genealogy of the descendants of John and Mary Barker McKusick. - McLain
- Database of the family is included to help with your search. - McLaurin
 - McMenamin / McMenomey
- Searching for Donegal ancestors and their homeplaces, and for possible relatives in Ireland, America or elsewhere. - McMenemy
- For McMenemy (and variants) families across the world, for the purpose of sharing family histories and information. - McMurphy
- Family genealogy and history information. - McPhail
- Family research and genealogy site. - McPherson
- Descendants of William McPherson and Nancy Wiley of Blackwater, Virginia. - Meddemmen
- Offers surname history, photos, family tree, and contacts. - Mercaldo
- Also including the surnames, Benner, Brooks, Buehrie, Buono, and others. - Meriwether
- Hereditary society of the descendants of Nicholas Meriwether (1631-1678). - Merkel
- Surnames include Merkel (xonnections to Iffezheim and Langenbrand, Germany) Sippel, Barrett, Pabst, Ruff, and many others. - Merritt (1)
- Metcalf / Waslin
- Includes family history resources for the English surnames Andrew, Bradley, Gill, Harrison, Herrington, Maude, Metcalf, Meggitt, Nelson, Pearson, Shaw, Thornton, Turner, Waslin. - Metzler
- Other surnames include: Burr, Greene, Christian, McAbee, Eaton, McCann, Greenler, and Wilbourne. - Michalak / Mazur
 Middlebrook
- Also including the names Blunt, Mew, and Anderton.- Middleton (1)
- Midgley
- Presenting information about the people and places called Midgley. - Millard
- Beginning with Thomas Millard in 1681. - Millenaar
- Also spelled Millenear. - Miller (4)
- Mills (2)
Milner
- Also includes Turner and Dial. Milsom
- History of the family from Bath, England.- Mineyko
- Includes Papandreou, Sienkiewicz, Jablonowskis, Potockis, and Puslowskis information. Minnican
- Linking all the branches of the Minnican family worldwide, including the variant spellings Minican, Minnikin, and Minikin amongst others.- Minyard
- James and Susannah Minyard and their descendants from Franklin County, Ga. Miodonski
- Contains tree, photos, and history of the U.K. based family.- Miskell
 - Miyabara
- Organised in a genealogical format and is dedicated to friends and family. - Moeckly / Möckli
- Dedicated to Konrad Möckli and his son Johannes Ulrich Möckli. - Moen
- Also including genealogy information for Knudson and McKnight surnames. - Moffatt
- Decendents of William Nethorpe Moffatt, who, with his family, arrived at Lyttleton in the ship. - Monk
- Searching surnames: Cunningham, Shrewsbury, Blankenship, Mckinney, Akers, Rinehart, Hubbard, Rinehart, and others. - Monroe / Munroe
- Includes family trees and numerous original source documents. - Montague (1)
- Moody (2)
- Moore (1)
- Moring / Mooring
- Documenting the descendants and associated family lines of John Moring and Jane White of Virginia, c. 1640. Includes chart for determining familial relationships. - Morrill
- Dedicated to the descendants of Abraham and Isaac Morrill. - Morris (1)
- Morrison
- Includes pictures, queries, and online database. - Mort
- All branches of the family in America; information about newsletter, researchers, queries, family reunions, contacts, data exchange. Moston
- History of the Moston, Slater, Warrington, and Wood families of Cheshire.- Mottershead (1)
- Moyseowicz
- Family web pages, family trees, links to the name world wide, family histories and Polish language pages. Mudford
- Also Evans, Stone, Lloyd, Walters, Francis, and Hillier.- Mueller
- Descendants of Ernest F.W. Mueller born in 1832 in Celle, Germany. Mullens / Harrison
- Collectors of pedigrees, letters, wills, and other documents held by the Mullens Harrison family.- Munford
- Ancestors and others who share the Munford surname or its derivatives. - Murnanes
- Of Tipperary, Cork, and Limerick. - Murray
 Muschamp
- Research into the family history from the origins in the 11th century, through to the present day.- Myers (1)
- Mytton
- Traces the Mytton lineage as far back as 1154.
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