Names of cultural spheres (e.g. Francosphere, Lusosphere)?

There aren't words for most of the latter because they are not large enough cultural/linguistic areas or simply not influential enough to warrant the use of the -sphere suffix, although I have seen Arabosphere and Indosphere in use. (The preferred terms seem to be "the Muslim world" and "South Asia".)

That said, the most common terms seem to be Anglosphere, Sinosphere, Hispanosphere, and Indosphere. (Russosphere, Lusosphere and Francosphere appear occasionally, but "Former Soviet Union", "Lusophonia" and "Francophone countries" appears to be the preferred terms).