I have searched my surnames with Google on the net in different manners.
First of all I have searched my full name "Fidel Bellmunt", finding that no other person than me is in the net with the same name and family name.
Than I have searched Bellmunt alone, and I have found, what I already knew, there are several places around Catalunya, where I'm from, with this name. There is a town, Bellmunt de Priorat, a Sanctuary, some geographic relieves (such as the Anticlinal de Bellmunt). That's quite logic since Bellmunt could be translated as "nice hill", so it is easy to think that places around some singular hill were named after it or related to it.
Finally I've searched my second surname, Montagut (it's meaning is also related with geography and hills: acute hill). In this case I have found a lot of links with the French culture, and an entry in the Wikipedia that summarises the most relevant matches: Montagut is a French clothing company located in Saint-Sauveur-de-Montagut. There's also a French village and commune called Montagut in the Pyrénées-Atlantiques department. In Catalunya there is a town in La Garrotxa called Montagut i Oix and a college in Vilafranca del Penedès called Escola Montagut.