"Saskia heeft zeven witte eenden."
Translation:Saskia has seven white ducks.
Saskia is a Germanic name meaning the (female) Saxon. The Saxons are one of the Germanic tribes ancestral to the modern Dutch (and to the modern British, at least linguistically - hence Anglo-Saxons). It was also the name of Rembrand's wife. In Germany the name is not rare but also not very common. I guess in the Netherlands it's at least as common.
I heard that the course creators have immortalised their partners' first names in this course, so you might even encounter a rare name or two.