 The name Paczków itself comes from the Old Polish male name Pakosław.Paczków, mentioned in medieval documents under the Latinized Old Polish names "Paczkaw" ("Liber fundationis episcopatus Vratislaviensis") and "Patzkow" ("Book of Henryków"), quickly grew, becoming not only a market town, but also a stronghold, guarding southwestern borders of the ecclesiastical Duchy of Nysa of fragmented Poland.It was granted the so-called Flemish rights, based on Magdeburg rights.