Name: Iu Mien
Native name: Iu Mienh
Flag:
ISO: ium
Name: Ga
Native name: Ga
Flag:

ISO: gaa
Name: Mixtec
Native name: Tu'un savi (there are many varieties of Mixtec and their native names differ, but this is a common one)
Flag:
ISO: mix (actually there are about 50 ISO codes, but "mix" is the one for the Mixtepec variety, and will be an easy one to use since it will be the easiest to remember)
This is similar to how Zapotec has been listed here (there are also 50+ varieties of Zapotec), but the difference is that Zapotec has an official macrolanguage code that covers all of them, while for some reason no such macrolanguage ISO code exists for Mixtec.