Captain Obvious checking in: the name (which Engadget classified as "tongue-twisting") literally means "wind strength", or "wind speed" as its called in actual English. It's two words: "vind" is (surprise) "wind" and "styrka" is "strength". The latter can be pronounced decently by pretending the "y" is perhaps a double "e", or something.

It is, admittedly, is a bit weird of a name for a sensor that measures air quality but on the other hand it's Ikea and they name things after their own mind.

Source: am Swedish.