The surname Gilmor is believed to have originated in Scotland, where it first appeared in the late 12th century. It is derived from the Gaelic personal name "Gillemor," which means "servant of Mary." This name was likely taken by an early bearer who was devoted to the Virgin Mary or may have been born on her feast day.
One of the earliest recorded instances of the name is found in the Ragman Rolls of 1296, a record of Scottish nobles and landowners who swore allegiance to King Edward I of England. In this document, the name appears as "Gylmor."
During the 13th and 14th centuries, the name Gilmor was concentrated in the Scottish Lowlands, particularly in the regions of Ayrshire and Renfrewshire. It is believed that the name may have been associated with the lands of Gilmour in Renfrewshire, which could have been granted to an early bearer of the name.
In the 16th century, the surname began to appear in various spellings, such as Gilmour, Gilmore, and Gillmor. One notable bearer of the name from this period was Sir John Gilmour (c. 1530-1603), a Scottish clergyman who served as the Moderator of the General Assembly of the Church of Scotland in 1578.
Over the centuries, the Gilmor family spread to other parts of Scotland and beyond. In the 17th century, Robert Gilmor (1635-1705) was a Scottish merchant and landowner who established himself in the Burgh of Canongate, near Edinburgh.
As the name spread to other regions, it also took on different spellings and variations. In Ireland, for instance, the name was sometimes spelled as Gilmer or Gildmore. One notable Irish bearer of the name was Andrew Gilmore (1828-1901), a Protestant nationalist and Member of Parliament for County Down.
In the United States, the Gilmor family has roots dating back to the 18th century. One of the earliest recorded instances is Robert Gilmor (1748-1834), a prominent Baltimore merchant and landowner who played a significant role in the city's economic and social life during the early years of the republic.
Other notable individuals with the surname Gilmor include William Gilmor (1791-1872), a Scottish-born American businessman and philanthropist who made his fortune in the shipping industry; and Sir John Gilmour, 2nd Baronet (1876-1940), a British politician who served as Secretary of State for Scotland from 1924 to 1929.