O'Daily 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'Daily is O Dalaigh, from the word "dalach," which comes from "dail," which means "assembly."
Early Origins of the O'Daily family
The surname O'Daily 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'Daily family
This web page shows only a small excerpt of our O'Daily 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'Daily History in all our PDF Extended History products and printed products wherever possible.
O'Daily Spelling Variations
In the Middle Ages many people were recorded under different spellings each time their name was written down. Research on the O'Daily family name revealed numerous spelling variations, including Daly, Daley, Daylie, Dayley, Dalley, Dailey, Daily, Dailley, Dally, O'Daily, O'Daley and many more.
Early Notables of the O'Daily 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...
Migration of the O'Daily family
Ireland saw an enormous decrease in its population in the 19th century due to immigration and death. This pattern of immigration began slowly in the late 18th century and gradually grew throughout the early portion of the 19th century. However, a dramatic increase in the country's immigration numbers occurred when the Great Potato Famine struck in the 1840s. The early immigrants to North America were primarily destined to be farmers tending to their own plot of land, those that came later initially settled within pre-established urban centers. These urban immigrants provided the cheap labor that the fast developing United States and soon to be Canada required. Regardless of their new lifestyle in North America, the Irish immigrants to the United States and Canada made invaluable contributions to their newly adopted societies. An investigation of immigrant and passenger lists revealed many O'Dailys: the Widow Daley who settled in Canada in 1846.
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