What is is siegel a jewish name?

Yes, Siegel is a Jewish name. It is a German and Yiddish surname derived from the word "sigel" which means seal or insignia in German. The name is commonly found among Ashkenazi Jews and has been in use in Jewish communities for centuries. Many notable Jewish individuals have had the Siegel surname, including movie producer and gangster Benjamin "Bugsy" Siegel, and renowned physicist and Nobel laureate Charles Siegel.