It means person devoted to Santa Marta. a person who believes in miracles and prays to Santa Marta. It can also be considered as inhabitants of Santa Marta, but it is little used. In Colombia is used as name for those born, resident or from Santa Marta, samarium (but lends itself to confusion with the born in Samaria, population of Caldas in Colombia and city or region of Israel).
It strikes me what Jorge Luis of the gentilicio of Santa Marta de Betania in Colombia. I think that the inhabitants of samarium responds to the fact that Bethany was a city of the Palestinian region of Samaria which is spoken in some passages of the Gospels, such as the death of Lazarus, brother of Martha and Mary. Here in Spain we have many locations with this name as Santa Marta de Tera at Zamora or Santa Marta de los Barros in Badajoz. We call santamartenses or santamartinos to the natives of Santa Marta.
