Mortimerr History, Family Crest & Coats of Arms
We must look to France for the early origins of the name Mortimerr. For it is here that early records this family descends from Walter, Lord of St. Martin, Normandy who married a niece of the Duchess Gunnora c. 980. Roger, Sire de Mortimer was a leader of the army of Duke William and helped defeat the French in 1054. 
His son Roger de Mortimer was a leader at the Battle of Hastings and was granted a great barony for his efforts. From him, descended the Lords Mortimer of Wigmore, Earls of March.
Very few entries in the Domesday Book of 1086 include a full name; this name is one of those exceptions. For there, we find Ralph de Mortemer, de Mortuo Mari.  
The etymology of the name, however, is a reference to the family's place of residence prior to the Norman Conquest of England in 1066, Moretemer, in the Seine-Maritime region of Normandy  where Mortemer derives from the Old French "mort," meaning "dead," and "mer," meaning "sea."
Early Origins of the Mortimerr family
The surname Mortimerr was first found in Herefordshire where Ranulph de Mortimer (before 1070), who accompanied William the Conqueror was granted Wigmore Castle. The family became the Lords of Wigmore. The Hundredorum Rolls of 1273 revealed the following entries: Ralph de Mortimer in Lincolnshire; and Hugh de Mortuomari, and Lucia de Mortuomari in Herefordshire.  "The parish [of Woodham-Mortimer], called in some documents Little Woodham, derives its present adjunct from the family of Mortimer, to whom it anciently belonged." 
Peter Mortemer held lands in Sussex according to the Subsidy Rolls of 1296. 
Some of the family held a family seat at Attleburgh in Norfolk in ancient times. "It was anciently the capital of Norfolk, and the residence of Offa and Edmund, kings of East Anglia; and was subsequently the seat of the Mortimer family, the site of whose baronial hall is still encompassed by a moat. In the reign of Richard II., Robert de Mortimer founded a collegiate establishment, in the church of the Holy Cross, for a warden and four secular priests." 
Some moved up to Scotland. "The first of the name recorded in Scotland is probably William de Mortimer who sometime after 1165 witnessed King William the Lion's confirmation of the charter of Philip de Euermel to Neubotel." 
Early History of the Mortimerr family
This web page shows only a small excerpt of our Mortimerr research. Another 192 words (14 lines of text) covering the years 1328, 1827, 1287, 1330, 1321, 1324, 1328, 1360, 1352, 1381, 1374, 1398, 1376, 1409, 1390 and 1411 are included under the topic Early Mortimerr History in all our PDF Extended History products and printed products wherever possible.
Mortimerr Spelling Variations
Before English spelling was standardized a few hundred years ago, spelling variations of names were a common occurrence. Elements of Latin, Norman French and other languages became incorporated into English throughout the Middle Ages, and name spellings changed even among the literate. The variations of the surname Mortimerr include Mortimer, Mortimor and others.
Early Notables of the Mortimerr family (pre 1700)
Outstanding amongst the family at this time was Roger Mortimer, 1st Earl of March (c.1287-1330), an English nobleman in the Welsh marches, who surrendered to Edward II in 1321, and escaped from the Tower of London in 1324; and his son, Sir Roger de Mortimer, 2nd Earl of March, 4th Baron Mortimer, KG (1328-1360), an English nobleman and military commander during the Hundred Years' War; and his son, Edmund de Mortimer, 3rd Earl of March and jure uxoris Earl of Ulster (1352-1381); and his son, and Roger de Mortimer...
Migration of the Mortimerr family
In England at this time, the uncertainty of the political and religious environment of the time caused many families to board ships for distant British colonies in the hopes of finding land and opportunity, and escaping persecution. The voyages were expensive, crowded, and difficult, though, and many arrived in North America sick, starved, and destitute. Those who did make it, however, were greeted with greater opportunities and freedoms that they could have experienced at home. Many of those families went on to make important contributions to the young nations in which they settled. Early immigration records have shown some of the first Mortimerrs to arrive on North American shores: John Mortimore, who came to Virginia in 1663; James Mortimer, who came to Pennsylvania in 1696; Margaret Mortimer, who came to Pennsylvania in 1683; George Mortimore, who arrived in Jamaica in 1716.