O'Daly History, Family Crest & Coats of Arms
The spelling and overall form of Irish names often vary considerably. The original Gaelic form of the name O'Daly is O Dalaigh, from the word "dalach," which comes from "dail," which means "assembly."
Early Origins of the O'Daly family
The surname O'Daly was first found in the barony of Magheradernon, in County Westmeath and traditionally claim descent from Eanna Ceannselach (Ian Kinsella), King of Leinster. They became Chiefs of Muintir Bhaire in the south west of Cork, and later in the north west of the same county, largely in O'Keefe's country. A distinct sept was found in Desmond as early as 1165.
"Cuconnachta-na-Scoil O'Daly (or "Cuconnachta of the Schools") was the first of this family that assumed the surname." 
Early History of the O'Daly family
This web page shows only a small excerpt of our O'Daly research. Another 198 words (14 lines of text) covering the years 1139, 1680, 1600, 1595, 1662, 1595, 1583, 1617, 1595, 1665, 1638, 1721, 1574, 1614, 1902, 1976, 1955 and 1976 are included under the topic Early O'Daly History in all our PDF Extended History products and printed products wherever possible.
O'Daly Spelling Variations
Numerous spelling variations of the surname O'Daly exist. A partial explanation for these variants is that ancient scribes and church officials recorded names as they were pronounced, often resulting in a single person being recorded under several different spellings. Different spellings that were found include Daly, Daley, Daylie, Dayley, Dalley, Dailey, Daily, Dailley, Dally, O'Daily, O'Daley and many more.
Early Notables of the O'Daly family (pre 1700)
Notable amongst the family name at this time was Daniel O'Daly (1595-1662), Irish diplomat and historian. He was "a native of Kerry, born in 1595, was member of a branch of an Irish sept which took its name from an ancestor, Dalach, in the twelfth century. His family were among the adherents of the Earl of Desmond, who was attainted for having opposed the government of Queen Elizabeth in Ireland, and was killed there in 1583. " 
Angus O'Daly (d. 1617), was the Irish...
The 19th century saw a great wave of Irish migrating out of their homeland in a great measure due to the oppressive imperial policies of the English government and landowners. Many of these Irish families sailed to North America aboard overcrowded passenger ships. By far, the largest influx of Irish immigrants to North America occurred with Great Potato Famine during the late 1840s. These particular immigrants were instrumental in creation of the United States and Canada as major industrial nations because the many essential elements such as the roadways, canals, bridges, and railways required an enormous quantity of cheap labor, which these poor immigrants provided. Later generations of Irish in these countries also went on to make valuable contributions in such fields as the arts, commerce, politics, and education. Extensive research into immigration and passenger lists has revealed many early immigrants bearing the name O'Daly:
O'Daly Settlers in United States in the 20th Century
Some of the first settlers of this family name were:
O'Daly Settlers in Canada in the 20th Century
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: Deo fidelis et Regi
Motto Translation: Loyal to God and king