I wasn't sure where the first name of my ancestors brother's came from as it was a break from the usual John, William, Patrick etc. He was born in the 1770s. The name is an area in Scotland.
I've been able to link it, and he's been named after his mother's first cousin's husband who was an Earl of this region. I received proof of this when I found his gt-aunt's will. She left some money and her jewels and trinkets to a few members of our branch of the family, but the bulk of her assets to the descendants of her niece and her husband the Earl.