He adopted the additional surname of Davie in 1846 at the same time as his parents .
Born Ferguson , he was the eldest son of Whig MP for Haddington Burghs Henry Ferguson Davie ( then Henry Ferguson ) and Frances Juliana Davie .
Ferguson adopted the additional surname of Henry Ferguson in 1846 at the same time as Ferguson 's parents .
Born Ferguson , he was the eldest son of Whig MP for Haddington Burghs Henry Ferguson Davie ( then Henry Ferguson ) and Frances Juliana Davie .