Marmyun History, Family Crest & Coats of Arms
The Ancestry of the Marmyun name lies with the Norman Conquest of England. This Norman name was used for a person who was a mischievous child, or who liked to play tricks and make jokes, having derived from the Old French word "marmion," meaning "monkey."  
We include this first origin only because of the fact that two noted sources do so. We prefer another source which is just a qualified and we believe more likely.
"They appear to have been a branch of the Tessons. Ralph Tesson, who brought 120 knights of his dependence to the aid of Duke William at the battle of Val des Dunes in 1047, founded c. 1055 the Abbey of Fontenay, near Caen (Gall. Christ xi. 413). A charter of his was witnessed by William Marmion or Marmilon, probably his brother, c. 1070 (Ibid.), who, with his family possessed part of Fontenay. Robert Marmion, his son, Viscount of Fontenay-le-Tesson, passed into England with the Conqueror, and had extensive grants, his descendants a century later holding 17 fees in England and 5 in Normandy (Lib. Niger: Feoda Norm. Duchesne).  The Tessons of Normandy bore Gules a fesse Ermine; the Marmions Vair a fesse Gules." 
Early Origins of the Marmyun family
The surname Marmyun was first found in Warwickshire.
"They were, it is said, the hereditary Champions of Normandy; and after the Conquest, Robert de Marmion held the castle and manor of Tamworth that he received Tamworth from the Conqueror 'is verified,' says Dugdale, by an ancient window in this church, where the said King, 'being depicted in his Robes of State, and crowned, stretcheth forth his hand to him, holding a Charter therein, neer the Gate of a faire Castle.' in Warwickshire and Scrivelsby in Lincolnshire by the tenure of performing that office at the King's coronation; being bound 'to ride completely armed upon a barbed horse into Westminster Hall, and there to challenge the combat with whomsoever should dare to oppose the King's title to the crown.' His seat was at Tamworth Castle, the head of his Warwickshire barony." 
Robert Marmion (died 1218), the 6th Baron of Tamworth, was an English nobleman, an itinerant justice and was reputed to have been the King's Champion."The chiefs of this great house are stated to have been hereditary champions to the Dukes of Normandy, prior to the Conquest of England: certain it is, that Robert de Marmyon, Lord of Fonteney, Robert de Marmyon, Lord of Fonteney, obtained from his royal master, not long after the battle of Hastings, a grant of the manors of Tamworth, co. Warwick, and Scivelsby, co. Lincoln, the latter to be held 'by service of performing the office of champion at the King's Coronation.' "  
Early History of the Marmyun family
This web page shows only a small excerpt of our Marmyun research. Another 91 words (6 lines of text) covering the years 1066, 1425, 1489, 1603, 1639, 1449 and 1302 are included under the topic Early Marmyun History in all our PDF Extended History products and printed products wherever possible.
Marmyun Spelling Variations
Norman surnames are characterized by a multitude of spelling variations. The frequent changes in surnames are largely due to the fact that the Old and Middle English languages lacked definite spelling rules. The introduction of Norman French to England, as well as the official court languages of Latin and French, also had pronounced influences on the spelling of surnames. Since medieval scribes and church officials recorded names as they sounded, rather than adhering to any specific spelling rules, it was common to find the same individual referred to with different spellings. The name has been spelled Marmion, Marmyon, Merryman, Merriman and others.
Early Notables of the Marmyun family (pre 1700)
Outstanding amongst the family at this time was Baron Marmyon of Tamworth, Simon Marmion (c. 1425-1489), a French or Burgundian Early Netherlandish painter of panels and illuminated manuscript.
Shackerley [Shakerley, Shakerly, Schackerley] Marmion [Marmyon, Marmyun, or Mermion] (1603-1639), was...
Migration of the Marmyun family to Ireland
Some of the Marmyun family moved to Ireland, but this topic is not covered in this excerpt.
Migration of the Marmyun family
Many English families emigrated to North American colonies in order to escape the political chaos in Britain at this time. Unfortunately, many English families made the trip to the New World under extremely harsh conditions. Overcrowding on the ships caused the majority of the immigrants to arrive diseased, famished, and destitute from the long journey across the stormy Atlantic. Despite these hardships, many of the families prospered and went on to make invaluable contributions to the development of the cultures of the United States and Canada. Early North American immigration records have revealed a number of people bearing the name Marmyun or a variant listed above: Henry and Margaret Marman, who settled in Virginia in 1732; Mary Marmion settled in Virginia in 1654; Mathew and Jane Marmion arrived in Philadelphia in 1871.