The surname is probably derived from the Irish adjective "meirtneach" meaning "dispirited." The name would have likely arisen from a nickname.
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Early Origins of the Mernagh family
The surname Mernagh was first found in County Wexford and neighboring areas in Counties Carlow and Wicklow. Bearers of the name are closely associated with the Kavanaghs, and it is very likely that the Mernagh family are a branch of the MacMurrough Kavanagh Sept.
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Early History of the Mernagh family
This web page shows only a small excerpt of our Mernagh research. More information is included under the topic Early Mernagh History in all our PDF Extended History products and printed products wherever possible.
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Mernagh Spelling Variations
Spelling variations of this family name include: Mernagh, Merna, Merenagh and others.
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Early Notables of the Mernagh family
More information is included under the topic Early Mernagh Notables in all our PDF Extended History products and printed products wherever possible.
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Mernagh migration to the United States
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Some of the first settlers of this family name were:
Mernagh Settlers in United States in the 19th Century
Michael Mernagh who immigrated to New Orleans in 1848
John Mernagh who immigrated to New Orleans in 1849
Edward Mernagh, who settled in New York City in 1849
Mary Mernagh, who settled in New York City in 1851
Patrick Mernagh and his family settled in New York City in 1853
Mr. John Robert Mernagh (d. 1912), aged 26, Irish Third Class passenger from Ballywilliam, Wexford who sailed aboard the RMS Titanic and died in the sinking 1
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: Siochthain agus fairsinge Motto Translation: Peace and plenty.
Mernagh migration to the United States 
Ireland
