I don't have great names for them, but 5 "ocean" continents and 5 "land" subcontinents.
Basically:
North America (new name welcomed)
South America (ditto)
Africa
Australia
Antarctica
then split the Eurasian subcontinent along major watershed lines.
Europe: (N of Caucuses, W. of Urals Include Volga but not Ural watershed)
Siberia: (any watershed that empties into Arctic Ocean, Okhost, or Bearing Sea. Insular watersheds in "stans" area TBD)
Desh (S. Asia, other new name): Indus watershed to the NW, all watersheds that empty into Bay of Bengal
Asia-Pacific (new name welcomed): All watersheds that empty to Pacific, Andaman Sea, China seas)
"Original/Old Asia" (new name welcomed): Basically everything that's left. W. of Indus watershed, E. of Suez, Caspian and Aral watersheds exc. European Volga-to-Caucuses strip)
@jhv I think years ago you asked why I was playing with watershed maps, this is it.