Dutch people in Poland / "Olędrzy", osadnictwo w Polsce

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Olędrzy settled everywhere in Poland, half of them weren’t Dutch but Belgian, Frisian, Danish, German, Scots, etc. I’ve got Olęder ancestry from my maternal grandfather’s family.

these were Germans indeed

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but here about Dutch people and others (with polish narration of course)

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Saska Kępa
https://en.wikipedia.org/wiki/Saska_K%C4%99pa

Saska Kępa (Polish pronunciation: [ˈsaska ˈkɛmpa]) is a neighbourhood in Warsaw, Poland, part of the Praga Południe district. It is also the home to one of Warsaw's largest urban parks, the Park Skaryszewski.

1628. Saska Kępa (in the right-bank Warsaw) was once a marshy island on the Vistula and was called Kępa Olenderska. It was developed and inhabited by Dutch settlers. In later times, received the name "Saxon" from the Saxon soldiers stationed there.

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Wilamowice
https://en.wikipedia.org/wiki/Wilamowice

According to historians, after the desolation of Polish lands by the Mongol invasion in 1241, the then Silesian Piast rulers of the Duchy of Opole and Racibórz decided to bring settlers from the West to the deserted and destroyed lands around the Silesian Foothills, to revive agriculture, industry and trade.[2] The area was settled in the course of the German eastward colonization of Slavic lands. In this way, around 1250, a group of colonists from the area of former Flanders came to the region, specifically from Friesland, near Bruges and established the settlement Wilamowice.[2]

The name derives from the name Willem.

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Pasłęk
https://en.wikipedia.org/wiki/Pas%C5%82%C4%99k

The town was founded by settlers imported from Holland by the Teutonic Order in the late 13th century — hence its original name, Preußisch Holland, meaning Prussian Holland. It is the oldest Dutch settlement in present day Poland. It is located in the Prussian historical region of Pogesania.

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Vistula delta Mennonites
https://en.wikipedia.org/wiki/Vistula_delta_Mennonites