How about TeaSDK, CoffeeSDK, or GrapeSDK? :p
Not entirely serious, but also not entirely kidding. Grape sounds like a good candidate as a common umbrella for Wine and related projects, since Wine is generated from Grape. Also grape is a simple English word that any primary school student should know well. Last but not least "GrapeSDK" in google search shows no conflicts.
I couldn't make up a strong connection between Grape and MinGW-w64 though, maybe other people can jump in and support?
For TeaSDK and CoffeeSDK, maybe they are less relevant, but it wouldn't hurt to have competition ideas ^^
BTW, in 2016 I (and many people's help) built a CI environment to support building both Win32/Linux programs on the same server with uniform usage and configuration without Windows License. The Win32 support was implemented using Wine with Cygwin/MSYS2 support, and I decided to call the CI server TeaCI:
(Lack of maintenance, stop working these days, shame on me)