It comes from the Biblical name of Jan. Janowski means the son of Jan. It's like Johnson meaning the son of John.
There were over 65,000 with the name of Jankowski in Poland in 1999.
Hi Alexander and Tina,
I will add to what Tina has so nicely explained. Even though the letter Y is in the Polish alphabet, there is no Polish name or Polish word that begins with Y. (It will be used if the word or name is borrowed from another language.) Similarly, Polish spelling does not use the -ovski suffix; rather, it uses -owski. So, I agree completely with Tina's spelling of Janowski. The Yanovski spelling appears to be an anglicized version to make the pronunciation by non-Polish speakers sound correct.
Best of luck in your research,
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