I have no clue whether this has anything to do with the French president, but that's an interesting thing to think about here. A macron is a linguistic term for a horizontal diacritical line placed over a letter, usually used to mark heavy syllables. The word macron is from the Greek term makron, a conjugation of earlier makros, which meant "long" (kind of an etymological oxymoron, since a macron today is a rather short dash) and is the etymon of the prefix macro-, meaning "on a large scale". Makros definitely came from Proto-Indo-European, but the reconstruction varies with sources; it could be something like mak, mhkros, or mehk, all of which have a prominent m and k and mean something like "long" as well. Usage of the word has flatlined since 1880, but usage of macro- has dropped since 1990.
Adam Aleksic, a rising sophomore studying linguistics and government at Harvard University, has been described as the internet's sixth most famous etymologist. He also has disturbing interests in politics, vexillology, geography, board games, conlanging, and law.