Well Poe's parents were stationed on Yavin, but are they Yavish?
Yavish? Maybe Yavinese? Yavinian? Yavinesian?
Technically it's Yavin IV, so may Yavinfourvish? Yavinfourian?
I'm going to wonder about this for hours, or until something shiny distracts me.
I've never understood the propensity for just numbering up planets in sci-fi stuff...
I mean, we don't tell folks we live on Sol III do we?
That is only because we have yet to be annexed by the 'Dragonnes' of Draconis V. Just wait.