Is the name/word Stein, as in beer stein, Jewish or German?

It MEANS stone as the mugs are "pottery".  Just like in the US we have a GLASS of beer. 

German.Yiddish is a German dialect so most of the words are the same.

It’s Old High German, the Low German equivalent is Steen. 

Literally translatesd as "stone" I think.

Sounds funny, lets have a few stones of beer.

German.  Yiddish is a German dialect so most of the words are the same.  Yiddish is Yiddish for Jewish.  The language spoken in the State of Israel is a modernised version of classical Hebrew.

German originally, adopted by Jews like how blacks have white last names. Jews migrated to Germany and intermixed, then became German Jews.