Since village of Jaszowiec near Ustron is from Silesia i wonder how would local Ślůnzoki call it in their dialect? If anyone knows please tell me.
I would say that they pronounce Jaszowiec the same as the rest of Poles. It is geographical name, so they pronounce it as everybody.
The small difference can be in accent. They can put accent on the first syllable Jaszowiec, whereas rest of Poles say Jaszowiec, but I am not quite sure