Then yes.

https://forward.com/news/6385/czech-records-tell-the-story-of-how-jewish-kohn-be/

From a Jewish magazine

https://www.nytimes.com/2004/05/16/us/kerry-s-grandfather-left-judaism-behind-in-europe.html

If you can access the NYTimes

Kerry is a fake name, changed by deed pool and defects from his actual ancestral roots. He is a Kohn.

Jews changing their name and ‘converting’ to ie concealing themselves amongst, another religion is a phenomenon termed ‘crypto-judaism’

https://m.jpost.com/diaspora/article-715350

Then yes.

https://forward.com/news/6385/czech-records-tell-the-story-of-how-jewish-kohn-be/

From a Jewish magazine

https://www.nytimes.com/2004/05/16/us/kerry-s-grandfather-left-judaism-behind-in-europe.html

If you can access the NYTimes

Then yes.

https://forward.com/news/6385/czech-records-tell-the-story-of-how-jewish-kohn-be/

From a Jewish magazine

Then yes