MacEffedy History, Family Crest & Coats of Arms
The surname MacEffedy originally appeared in Gaelic as "Mac an Mhadaidh," which is probably derived from the word "madadh," which means "warrior, dog." 
Another source claims the family claim descent through Owen Buac, brother of Owen Fionn, ancestor of O'Madadhain, of Connaught, slain, 1008; Anglicized O'Madden, Madden. The Madden family of Longford, County Galway, the O'Madden family of Balbriggan, County Dublin and the Madden family of Ulster are all branches of the original. 
Alternatively, the name could have been from "descendant of little Matthew (gift of Jehovah.)" 
Early Origins of the MacEffedy family
The surname MacEffedy was first found in County Galway (Irish: Gaillimh) part of the province of Connacht, located on the west coast of the Island, where they held a family seat from ancient times.
We did find this interesting entry for the Mudrigan variant in the parish of St. Martin, Cornwall, England: "Although this parish contains no manor, Mudgian is said formerly to have had manorial rights, when it belonged to a family of this name, and was their seat. From the Mudgians it passed with an heiress in marriage to the Chynoweths." 
Early History of the MacEffedy family
This web page shows only a small excerpt of our MacEffedy research. Another 126 words (9 lines of text) covering the years 1556, 1347, 1567, 1677, 1715, 1713 and 1715 are included under the topic Early MacEffedy History in all our PDF Extended History products and printed products wherever possible.
MacEffedy Spelling Variations
Spelling variations of this family name include: MacAvaddy, Madden, O'Madden, Madigan, Macavadan and others.
Early Notables of the MacEffedy family (pre 1700)
Another 42 words (3 lines of text) are included under the topic Early MacEffedy Notables in all our PDF Extended History products and printed products wherever possible.
Migration of the MacEffedy family
Some of the first settlers of this family name or some of its variants were: Edward Madden settled in New England in 1753; John Madden settled in Barbados in 1663; Andrew, Bernard, Daniel, David, Hugh, James, John, Mary, Patrick, Peter, Richard, Thomas and William Madden all arrived in Philadelphia between 1840 and 1860.