Yiddish

If it actually is (פאקטשאר), it would be spoken "Paktshar" or "Faktshar", of course, the "a" also can be an "o". "sh" can also be spoken as  "s". Could also be, that the original name maybe began with a "B", later it became a "P". Maybe Baksaer. (Some one, who came from Baksa). Or from the Yiddish word "pakhter" (pachter)=leaseholder, tax farmer