My ancestors were the Jutrzenka. Yes they were Kashubian. There is a town in Kreis Bütow, East Pomerania named Jutrzenka which is also known as Morgenstern which translates to Morning Star. In America there is a line that used the name Gitersonke and lived in Berrien Co, Michigan.
Lineage starts with Simon (Siemon, Siemonowi) Gendrecka, in 1530 Andreas Jutrzenka