Dowler History, Family Crest & Coats of Arms
The Dowler family name comes from the personal name Dougal. The Gaelic form of the name is Mac Dhughaill and literally means "son of Dougal." The personal name Dougal, meaning "dark stranger."  
"The claim of the Macdowells of Galloway to be descended from the ancient native lords of Galloway can neither be disproved nor can it be satisfactorily established." 
Early Origins of the Dowler family
The surname Dowler was first found in South Ayrshire where "Mactheuel witnessed a charter by Uchtredus filius Fergusi of the church of Colmanele (now known as Colmonell) in the reign of Malcolm IV. Fergus McDuhile in Wigton was juror on inquest at Berwick, 1296, and in same year as Fergus MacDowilt rendered homage [to King Edward I of England.] He is probably the Fergus MacDowile who witnessed a charter by William, lord of Douglas, 1306-29 (RHM., l, p. 13). In 1307 a pardon was granted Elyas de Vaus at the request of Duncan MacDuel, and in same year Dungall MacDouyl, senior, for services rendered, requested for his son Dungal, junior, the marriage of the daughter and heiress of Hugh de Champaigne, deceased, a tenant in capite." 
Early History of the Dowler family
This web page shows only a small excerpt of our Dowler research. Another 372 words (27 lines of text) covering the years 1684, 1312, 1347, 1354, 1578, 1390, 1416, 1515, 1609, 1621, 1602, 1677, 1675, 1268, 1359, 1363, 1590, 1666, 1690, 1597, 1603, 1605, 1650, 1653, 1685, 1760, 1685, 1708, 1755, 1760, 1744, 1739, 1824, 1739, 1743, 1766, 1766 and are included under the topic Early Dowler History in all our PDF Extended History products and printed products wherever possible.
Dowler Spelling Variations
Spelling variations are a very common occurrence in records of early Scottish names. They result from the repeated and inaccurate translations that many names went through in the course of various English occupations of Scotland. Dowler has been spelled MacDowall, MacDowell, MacDugald, MacDill, Dowall, Dowler and many more.
Early Notables of the Dowler family (pre 1700)
Notable amongst the Clan from early times was Duncan, Earl of Carrick; Ewen MacDougall (fl. 1268), Lord of Argyll; and Thomas MacDowell, Bishop of Galloway (1359-1363).
William MacDowell (1590-1666), the Scottish diplomatist, born in October 1690 at Makerstoun, Roxburghshire, was son of Thomas Macdowell by Johanna, daughter of Sir Andrew Ker of Greenhead. From 1597 to 1603 he attended Musselburgh school, and in 1605 proceeded to St. Andrews, where he had a distinguished career. King Charles I would have made him a Scottish privy councillor had not the civil war broke out On 4 June 1650. Macdowell became Charles II's resident agent...
In the United States, the name Dowler is the 10,367th most popular surname with an estimated 2,487 people with that name. 
Migration of the Dowler family to Ireland
Some of the Dowler family moved to Ireland, but this topic is not covered in this excerpt.
Numerous Scottish settlers settled along the east coast of the colonies that would become the United States and Canada. Others traveled to the open country of the west. At the time of the American War of Independence, some remained in the United States, while those who remained loyal to the crown went north to Canada as United Empire Loyalists. The highland games and Clan societies that sprang up across North America in the 20th century have helped many Scots to recover parts of their lost traditions. Research into passenger and immigration lists has revealed some of the very first Dowlers to arrive in North America:
Dowler Settlers in United States in the 17th Century
Dowler Settlers in United States in the 19th Century
Some of the first settlers of this family name were:
Dowler Settlers in Canada in the 18th Century
Emigration to Australia followed the First Fleets of convicts, tradespeople and early settlers. Early immigrants include:
Dowler Settlers in Australia in the 19th 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: Vincere vel mori
Motto Translation: Victory