Santiago is a commune (downtown Santiago). but there is also a urban area in the Metropolitan Region of Santiago (RM). That's the reason why there are places called "Las Condes, Santiago", "Vitacura, Santiago" or "Santiago, Santiago".
There are several towns called Santiago, see [[w:Santiago|Santiago in Wikipedia]]. E.g. [[w:Santiago de Chile|Santiago de Chile]] is in Chile, so in South America, while [[w:Santiago de Compostella|Santiago de Compostella]] is in Spain, Europe.