The first person in my tree with this surname was Isobel Prain.
My ancestral line is:
1 Lois Whimpey
2 Ivon Walter Whimpey (1923-2009)
3 Edith Jean Marr (1922-1990)
4 John Ernest Whimpey (1884-1960)
5 Ivy May Harley (1890-1959)
10 Alexander Alexander Harley (1866-1939)
11 Henrietta Louisa Russell (1865-1949)
20 Robert Harley (1817-1891)
21 Euphemia Dandie (1824-1902)
40 John Harley (1797-1864)
41 Agnes Moncur (1793-1850).
82 Thomas Moncur.
83 Isobel Prain (1749-?).
Isobel Prain married Thomas Moncur on 20 November 1777 in Longforgan, Perthshire, Scotland. I have not yet found a burial entry for Isobel, or her husband Thomas, although I know that Thomas died before 1817, as he was listed as the late Thomas Moncur at the time of his daughter Agnes’ marriage to John Harley on 16 February 1817.
There were two possible baptisms for Isobel in the Longforgan Parish registers:
The first Isobel was christened 12 February 1749, and was the daughter of William Prain and May Elder. The second was christened 6 July 1755, and was the daughter of Henry Prain and Isobel Cock.
Thomas Moncur and Isobel Prain had two sons, Thomas Moncur christened 28 July 1782, and William Moncur christened 4 July 1784. The census records indicate that the Thomas Moncur christened in 1782 married Margaret Brown, while his brother William married Amelia Finn.
It was the names given to Thomas and William’s children that indicated that their mother Isobel was the daughter of William Prain and May Elder. Thomas Moncur and Margaret Brown named their eldest daughter Isobel Elder Moncur, while William and Amelia named one of their sons William Elder Moncur.
William Prain and May Elder were married 24 March 1748 in Longforgan. There was a baptism of a William Prain on 3 April 1720 at Abernyte, Perthshire, Scotland, which appears to be for this William. His parents were James Prain and Isobel Martin.
James Prain and Isobel Martin were married 7 March 1717 in Abernyte, Perthshire. There was a James Prain who was baptised 3 March 1694 at Kinnaird, Perthshire, who was the son of James Prain and Janet Thomson. James and Janet had been married 22 June 1688 at Abernyte.
More information about the Prain family of Longforgan can be found in my post The Prains of Longforgan.