Dutch word kerstster comes from Dutch ster ((person) star. (television) short advertisement. Star.), Dutch kerst (Christmas.)

Detailed word origin of kerstster

Dictionary entry	Language	Definition
ster	Dutch (nld)	(person) star. (television) short advertisement. Star.
kerst	Dutch (nld)	Christmas.
kerstster	Dutch (nld)	(Christianity) star of Bethlehem, Christmas star. (plant) poinsettia, Euphorbia pulcherrima, Christmas star. Any star related to Christmas.