McMohyn History, Family Crest & Coats of Arms
In its ancient Gaelic form, the Irish name McMohyn was written Mac Mathghamhna, which later became Mac Mathuna. Both names are derived from the word "mathghamhan," which means "bear."
Early Origins of the McMohyn family
The surname McMohyn was first found in County Clare (Irish: An Clár) located on the west coast of Ireland in the province of Munster, where the MacMahons were lords of Corca Baisgin; and possessed the greater part of the baronies of Moyarta and Clonderlaw. 
"The Munster MacMahons formerly possessed the greater part of the Baronies of Moyarta and Clonderalaw, in the County Clare, in which county the predominant name now is McMahon." 
Early History of the McMohyn family
This web page shows only a small excerpt of our McMohyn research. Another 110 words (8 lines of text) covering the years 1119, 1715, 1780, 1519, 1606, 1644, 1600, 1650, 1643, 1650, 1660, 1737, 1707, 1715, 1715, 1737, 1680, 1747, 1727, 1737, 1737 and 1747 are included under the topic Early McMohyn History in all our PDF Extended History products and printed products wherever possible.
McMohyn Spelling Variations
One must realize that attempting to record a Gaelic name in English was a daunting task. Even today the translation is a difficult one. Names, therefore, often had many spelling variations. The variations of the name McMohyn include: MacMahon, MacMann, MacMahan, MacMohan and others.
Early Notables of the McMohyn family (pre 1700)
Notable amongst the family name at this time was Séamus mac Pilib Mac Mathghamhna (died 1519), was Bishop of Derry. Hugh Oge MacMahon (1606-1644), was an Irish conspirator, was probably of Sir Brian MacHugh Oge MacMahon, Lord of the Dartree in the county of Monaghan. Herber MacMahon (1600-1650), Bishop of Clogher in 1643, a Catholic leader, commanded the Ulster...
Migration of the McMohyn family
Suffering from poverty and racial discrimination, thousands of Irish families left the island in the 19th century for North America aboard cramped passenger ships. The early migrants became settlers of small tracts of land, and those that came later were often employed in the new cities or transitional work camps. The largest influx of Irish settlers occurred with Great Potato Famine during the late 1840s. Although the immigrants from this period were often maligned when they arrived in the United States, they provided the cheap labor that was necessary for the development of that country as an industrial power. Early immigration and passenger lists have revealed many immigrants bearing the name McMohyn: Bernard, Francis, James, John, Michael, Patrick MacMahan, who all arrived in Philadelphia, Pennsylvania between 1840 and 1860; Mary McMahan settled in Boston Massachusetts in 1849.
The motto was originally a war cry or slogan. Mottoes first began to be shown with arms in the 14th and 15th centuries, but were not in general use until the 17th century. Thus the oldest coats of arms generally do not include a motto. Mottoes seldom form part of the grant of arms: Under most heraldic authorities, a motto is an optional component of the coat of arms, and can be added to or changed at will; many families have chosen not to display a motto.
Motto: Sic nos sic sacra tuemur
Motto Translation: Thus we guard our sacred rights.