At least for the "Midnight Blizzard" part of the title, it's the result of a naming framework [0] for threat actors that Microsoft has been using since April 2023. I agree it sounds weird.
The naming framework for these groups isn't even consistent, with every vendor having their own scheme. Midnight Animal to one vendor is Dancing Bear to another and known by Wet Cat to yet another.
They all sound like bad translations to bargain-bin porno movies.
[0] https://learn.microsoft.com/en-us/microsoft-365/security/int...