James Clerk-Maxwell

His brother James was a lieutenant in the East Indian Navy, and married Janet Irving of Newton. He died in 1793, leaving two sons and a daughter. The elder son, afterwards the Right Honourable Sir George Clerk,2 succeeded to Penicuik on the death of his uncle, Sir John Clerk, in 1798; and the younger son John succeeded to the property of Middlebie, which descended to him from his grandmother, Dorothea, Lady Clerk Maxwell, and took the name of Maxwell. He married in 1826 Frances, daughter of Robert Cay of Charlton, and had one son, James Clerk Maxwell, born in July 1831, and died in Nov. 1879.

Source: The life of James Clerk Maxwell:with a selection from his correspondence and occasional writings and a sketch of his contributions to science (Google eBook) By Lewis Campbell, William Garnett Macmillan, 1882

From p. 16..

http://books.google.com/books?id=d2oOAAAAIAAJ&source=gbs_navlinks_s

NOTE:

[This person was added as referenced in a detailed explanation of the Clerk family on electricscotland.com at http://www.electricscotland.com/history/nation/clerk.htm ]