I have Andrew Brown who married Jane keith and had a child Jane Browm in 1866 and Elizabeth. Family folk law has them related to Robbie Burns. Unable to find them on any census that I have access to.
Robbie Burns grandmother was Isobella Keith b.1695 who married Robert Burness in Kincardine 1715. They had eleven children. Son William married Agnes Brown in 1757.
Robbie Burns mother was Anges Brown b1733 d.1820
Trying to link the two families.