Acronyms (which must be pronounced as words, unlike initialisms) were pretty rare until World War II, and many abbreviation explanations you hear for etymologies are fake, so that's something to be cautious about. The term acronym was first used in 1940 by literary critic Edwin Muir and took off, peaking in usage in 2004. That was borrowed from German akronym, which was created, by influence of words like homonym and synonym, out of the Ancient Greek word akron, meaning "summit" or "peak", and the suffix -onym, meaning "name". The idea was that an acronym is composed only out of the "peak" (uppercase) letters of the words that compose it. Akron, which is the etymon for the Ohio city name, comes from Proto-Indo-European hkros, which meant "sharp", and -onym derives from the PIE root hnomn, also "name".
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.