Numbered Homeworld: Averted. As we mentioned way back in Naming Your Colony World, inhabited systems generally do get named objects, if only because they’re easier to remember. Even uncontacted alien homeworlds get names, often a pronounceable transliteration of whatever the local name is, out of some respect for local sensibilities… and ease of memory/reference.
(Yes, this implies that Vonis Prime isn’t really called Vonis Prime…)
How many homeworlds are named “home”, “dirt”, “place were we are from”, “goddess of our ecology”. Or for flying or swimming species, “sky” or “ocean”. I’m guessing: most to all.