It's really only in Greece and Bulgaria where the official name for Macedonia is Former Yugoslav Republic of Macedonia, because both of these countries have regions also named Macedonia. In basically every other country on earth it's Republic of Macedonia or simply Macedonia, like A-lister said.
I personally think it's insulting to force a title or a name onto a country just because there's a part of your country that shares the same name. Who cares who took the name first? This is what Macedonia is called. It's a little sand box rhetoric, if you ask me: "well I saw it first!" The Macedonia of Greece and Bulgaria are not sovereign states and I think their Macedonias are the ones that needs to be specified which Macedonia it is, not the other way around. Not only is it rude to force Macedonia to add FYR to their name or be referred to as FYROM (even worse!), but it's also incredibly childish.
I personally think it's insulting to force a title or a name onto a country just because there's a part of your country that shares the same name. Who cares who took the name first? This is what Macedonia is called. It's a little sand box rhetoric, if you ask me: "well I saw it first!" The Macedonia of Greece and Bulgaria are not sovereign states and I think their Macedonias are the ones that needs to be specified which Macedonia it is, not the other way around. Not only is it rude to force Macedonia to add FYR to their name or be referred to as FYROM (even worse!), but it's also incredibly childish.