I had a student ask why this is not referred to as hydrogen monofluoride. Similar, we call H2S hydrogen sulfide, not dihydrogen monosulfide.
Could we just call those common names, but that by IUPAC naming, it is actually hydrogen monofluoride? Or is it really just hydrogen fluoride. I have seen various answers on other websites, but curious if anyone knows the official answer.
The most common reason I've seen is that because both H and F has a single site open for bonding that there is no other combination possible (so no need for numerical prefixes).