Why is a harmonica called a harp?

Why is it called a harp ? The term is partly inspired by the Aeolian harp, a stringed instrument that is left outdoors to be played by the wind, whose name was taken from Aeolus the god of the wind. Early names for the harmonica were Aeolina, Aeolian and Mund-Aeoline, which stressed this link with the Aeolian harp.