Alternate Names for Galicia-Lodomeria

In my timeline, the Kingdom of Poland is divided into Mazovia, Kuyavia, Prussia(Most of Silesia+Greater Poland+Prussia) and *Lesser Poland-Upper Silesia in 1300's, I am thinking of the name for the entity in where in Lesser Poland and Upper Silesia are united please suggest me names...
 
how come that poles would merge the oldest polish land (greater poland) and silesia with backwater non-polish pagan prussia and rename them?
 
Lesser Poland + Upper Silesia → Chrobatia(?), Wisły = Vistulia, Odrowiśle(??), Lechska, Lęska, Lędzka, Lędzice, Lędziska.
Alternative names for Red Ruthenia... - derivates from the Lendians (as above), also Krasnorussia, Chervenska, Halitska...
 
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