According to <<http://tunearch.org/wiki/Annotation:Mr._Sharpe%27s_Delight|tunearch.org>>:

> Sharpe was the son of William Kirkpatrick of Ailsland, a younger brother
> of Sir Thomas Kirkpatrick, 3rd Baronet of Closeburn. On inheriting Hoddom
> Castle, Dumfriesshire, in the Borders, Charles changed his name to
> Sharpe, the name of his uncle’s line, from whom he inherited the estate.
> He set to work on the castle, repairing and improving it, and adding
> several rooms. Sharpe had a reputation as an excellent violinist, and also
> composed music and verse. He was a friend and correspondent of Robert 
> Burns.

Sometimes spelled “Sharp” (without the final “e”).