I don't have any record of a Matthew Dalgarno in my tree but there is a James Dalgarno b. 1838 aprox Old Deer, and Alexander William Dalgarno b. 1844 aprox Old Deer. There parents were a John Dalgarno and Ann Finnie b. 1800 aprox, Old Deer, they were married 1818 aprox. I'm sure there is some connection as Old Deer is only a small village.