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In the 19th century, many Jews had to change their name format from e. g. "Son ben Father" to "Christian" name forms with a first name and a surname.
At least 2 families (who may or may not be related) were Jews in Santomischel ( https://en.wikipedia.org/wiki/Zaniemy%C5%9Bl) and were able to choose a location-based name, "Czempiń", which was a larger town in the vicinity.
Many members of at least one family Czempin were killed in pogroms in the 19th century and especially during the Holocaust, but some survived and their descendents (that still bear the original spelling of the name) live primarily in Germany.
Some emigrated to Israel, England and the US. In the latter two cases they usually changed their names to be phonetically simpler to understand to English native speakers, so "Chempin" or "Champain", for example.