Writing from the Ukrainian side of Galicia here, I would point out that Krakow is far from being the center of the region. Przemyśl or Zamosc lie much closer to the center if you include our side of Galicia where pierogis are widely popular as well.
Matter of fact my family and many others here cook and eat them every week on Sunday, which I now hold as a near and dear tradition. There is something special about rolling and folding the dough together, boiling the pierogis, cooking the mushroom/onion sauce.
Since this is a food cherished by both Poles and Ukrainians I find the name "galicean" a great fit as well, since it's a region shared between the two countries.