I can't find anything about it on Google, however I came across this website with Huguenot surnames, which has Kantyn listed as a surname variant- phoenixhollo.com/fr/Comt%C3%A9_de_Jerauld_0.html
My ancestors full name is Catherine Kantynowna, she married in 1778 in Klonówka, Poland. I know some Huguenot people escaped to Germany, but what are the chances of them ending up in Pomerania? If this even indeed the right way to look at it. If its a rare Polish surname it must have come from somewhere else.
I should note on the PTG Pomorskie Towarzystwo Genealogiczne records, they have it spelled at Kantynowna, however in a family tree book I have, its Kuntynowna. This is a link to a copy of the birth record from the family tree book,
It looks like Kuntynowna. I can't understand any of the other text. I don't know if her parents names are listed or place of birth.