It's a distinct regime, so useful to give it a distinc name. Super and hyper are roughly synonyms, but super was already taken.
There was also some precedence from wave research back in 1938 which suggested hypersonic and ultrasonic for high frequency waves[1].
At this point it's a well-established term, with 60 years of history[2].
[1]: https://www.ias.ac.in/public/Volumes/seca/007/03/0163-0176.p...
[2]: https://secwww.jhuapl.edu/techdigest/Content/techdigest/pdf/...
> Super and hyper are roughly synonyms
Perhaps you're right in terms of how they're leveraged in today's society. I'll drop my pedantry.
They roughly have the same meaning in the languages they were borrowed from, Latin[1] and Greek[2] respectively.
Yeah it's random, but established at this point. The radio bands aren't much better[3] with their Very High Frequency (VHF), Ultra High Frequency (UHF) and Super High Frequency (SHF) and Extremely High Frequency (EHF).
[1]: https://www.etymonline.com/word/super-