A combination of Ancient Greek πλᾰνήτης ["wanderer"] typically associated with ἀστέρες πλανῆται ["wandering stars"] and Ancient Greek Παναγία [Pangaea], to form a new meaning for "wandering plane", referring to a planet beyond Kepler.
Παναγία [Pangaea] - a former supercontinent that included all the landmasses of the earth before the Triassic period and that broke up into Laurasia and Gondwana.
Παναγία [Pangaea] - a very large continent that split into smaller ones in the Earth’s geologic past.
Παναγία [Pangaea] - a modern landmass composed of multiple continents.
The "ng" digraph shifted to remove the "g" sound, and leave just the "n" as it sounds in "English".