Not necessarily. It is generally very rash to make assumptions about a person's ethnicity simply on the basis of their family name.
Many Jews from Poland, Russia, Ukraine and the Baltic countries had German-language names, because Yiddish is largely derived from German. So having a German-sounding name does not make someone German, much less a German Jew.
Maybe I am and maybe I'm not.
You can't tell anything from a name. There are Catholic Finkelstein's, Jewish Obrien's, and Chinese Fellini's.
"Grunwald" is a German word, meaning "forest green", and first appeared as a family name in Germany.
Clara Grunwald has written: '\\' -- subject(s): Correspondence, Jewish teachers, Teachers
Ernest Grunwald died in 2002.
Ernest Grunwald was born in 1923.
Cross of Grunwald was created in 1943.
Cross of Grunwald ended in 1992.
Glen Grunwald was born in 1958.
The population of Gmina Grunwald is 5,648.
Lisa Grunwald was born in 1959.
Wilhelm Grunwald died in 1989.
Ernie Grunwald is 6' 4".
Lilo Grunwald is 5' 1".
Ash Grunwald was born on 1976-09-05.