I'm curios to know the origin of this Dutch word, poolster

I’m curios to know the origin of this Dutch word, poolster.

Poolster is a compound of the words pool (pole) and ster (star).
Pole Star, or Poolster in Dutch, is another name for the North Star (Alpha Ursae Minoris) or Polaris which, by the way, is actually a set of stars orbiting each other, though Polaris A is the overwhelmingly large and nakedly visible supergiant.

Ster comes from the Greek aster (star) and based on written records, appears to have entered the Dutch language in the latter half of the 12th century; pool comes from the Greek polos (pole) and appears to have entered the Dutch language toward the end of the 16th century. [ source: http://www.etymologiebank.nl/ ]

The Etymologisch woordenboek van het Nederlands does not indicate when the compound name Poolster entered into the Dutch language, but it was most likely in the 17th or 18th century, when the concept of a “pole star” became more common.

Alpha Ursae Minoris, commonly called the North Star or Pole Star or Poolster in Dutch, visible to the naked eye and closest to the Earth’s north celestial pole, has been described since the 5th century (when it was off from the celestial north pole by about eight degrees), though the name Polaris, which itself is a shortening of New Latin ‘stella polaris’ which means ‘pole star,’ was not designated until the 18th century, when Alpha Ursae Minoris had approached the celestial north pole by a few degrees. In the 10th century it was known as a “ship star,” indicating that it was used for navigation.
[sources: Wikipedia articles: Polaris, Pole star and Poolster]