Kadwalyder History, Family Crest & Coats of Arms
Brythonic in origin, the name of Kadwalyder came from the rugged landscape of Wales. The name is from the Welsh personal name Cadwaladyr. In Old Welsh, this name was Catguallon. Both Cornish and Breton, which along with Welsh, make up the family of Brythonic Celtic languages have cognate forms of this name; the Cornish form is Caduualant, and the Old Breton form is Catuualon.
Early Origins of the Kadwalyder family
The surname Kadwalyder was first found in Harlech, where they held a family seat from very ancient times, some say well before the Norman Conquest and the arrival of Duke William at Hastings in 1066 A.D. According to legend, this ancient family is descended from Cadwaladr (d. circa 664) Welsh King of Gwynedd, leader of the Celtic resistance against the Anglo-Saxons. Later accounts have made him a national hero, a Saint, and called him the last of the Kings of Briton. 
Cadwaladr (d. 1173), the son of Gruffudd, the son of Cynan, "was the son and the brother of the two most famous north Welsh princes of their time. During his father's lifetime he accompanied his elder brother, Owain, on many predatory excursions against rival princes. In 1121 they ravaged Meirionydd, and apparently conquered it. In 1135 and 1136 they led three successful expeditions to Ceredigion, and managed to get possession of at least the northern portion of that district. " 
Early History of the Kadwalyder family
This web page shows only a small excerpt of our Kadwalyder research. Another 73 words (5 lines of text) covering the years 1520, 1590, 1568, 1610, 1610, 1610, 1666 and 1690 are included under the topic Early Kadwalyder History in all our PDF Extended History products and printed products wherever possible.
Kadwalyder Spelling Variations
Although there are not an extremely large number Welsh surnames, there are an inordinately large number of spelling variations of those surnames. This variety of spellings began almost immediately after the acceptance of surnames within Welsh society. As time progressed, these old Brythonic names were eventually were recorded in English. This process was problematic in that many of the highly inflected sounds of the native language of Wales could not be properly captured in English. Some families, however, did decide to modify their own names to indicate a branch loyalty within the family, a religious adherence, or even a patriotic affiliation. The name Kadwalyder has seen various spelling variations: Cadwallader, Cadwelleder, Kadwalleder, Cadwinder and many more.
Early Notables of the Kadwalyder family (pre 1700)
Prominent amongst the family during the late Middle Ages was Casail Cadwaladr (fl. 1590), a Welsh poet, who flourished in the latter part of the sixteenth century. 
Roger Cadwallador (1568-1610), was an English divine, a native of Stretton Sugwas, Herefordshire. " At length, on Easter day, 1610, he was apprehended and taken before Dr. Robert Bennet, bishop of...
Migration of the Kadwalyder family
The Welsh migration to North America in the late 19th and early 20th centuries contributed greatly to its rapid development. These migrants were in search of land, work, and freedom. Those Welsh families that survived the long ocean journey were critical to the development of new industries and factories, and to the quick settlement of land. They also added to an ever-growing rich cultural heritage. A search of the immigration and passenger lists has shown a number of people bearing the name Kadwalyder: Humphrey Cadwellader who settled in Virginia in 1641; John Cadwalader settled with his wife in Philadelphia in 1820; C. Cadwalader arrived in San Francisco in 1852..