According to the Greeks, their problem with the name is that it serves as a potential territorial claim in the future. Which, of course, is further fueled by the occasional maps of a “United Macedonia” coming from the country’s more nationalistic circles (oh, wait, the second link is actually kinda ours). Though I think that’s just an excuse on the part of the Greeks – they can’t really be that stupid (unless they also think Great Britain can lay claim to French Bretagne based simply on the name). I think the name-issue is just a formal pretext against the unprecedented historical manipulations (or “history stealing”, as it’s popularly called in the region), which is a far more realistic problem than a mere name. Though in that case, “Let he who is without sin throw the first stone” comes to my mind, as there isn’t a single Balkan country that’s free from this.