In Dutch/Hollandic the star-constellation called karlsvagninn (Ice.),
karlsvognen (Dan.), big-dipper (Eng.) is called Woens waghen - that
is, Óðins vagn. Óðinn is called Rögnir, and the term Rögnis reið
occurs in Völsunga Saga/Sigrdrífumál, likely meaning 'Óðins vagn'. ON
Rögnis reið is solid, but I'm not sure how old *karls vagninn is;
nevertheless, Óðinn is called Karl in some old sources. A good Modern
English term would be Wodens wagon.