CastañedaSpanish Habitational name from any of various places called Castañeda, from a Spanish word meaning "chestnut grove", itself derived from castaña meaning "chestnut".
ChastainFrench From Old French castan"chestnut tree" (Latin castanea), a name for someone who lived near a particular chestnut tree, or possibly a nickname for someone with chestnut-coloured hair.