Castano Family History

Spanish and Galician (Castaño): from castaño ‘chestnut (tree)’ (Latin castanea), hence a topographic name for someone who lived by such a tree or a habitational name from any of numerous places named with this word. Southern Italian: from medieval Greek kastanon ‘chestnut’, hence a topographic name for someone who lived by a conspicuous chestnut tree, or a nickname for someone with chestnut-colored hair.

Source: Dictionary of American Family Names ©2013, Oxford University Press