Macedonia- Greek, Macedonian, or Bulgarian?

As many of you may know, the region of Macedonia is very contested in the south Balkans- four countries claim the region, Greece, [Former Yugoslav Republic of] Macedonia, Bulgaria, and Albania. (I left Albania out of the poll because there is no reason why it should be Albanian except for Albania's claim on the land.) Bulgaria actually controls minuscule parts of the region in the east and believes it is rightfully Bulgarian under the Treaty of London (1913)., while to Macedonia's south, Greece claims the area as part of its Macedonian province. However, the FYROM still controls most of the region, but was established well after Greece's Macedonian province. So, I would like to know- Greek, Macedonian, or Bulgarian?