>>35
Russian names end in -o, -ov and -ev, rarely have -in ending and almost never "-sky". Only Russian nobility had "-sky" surnames, but nobility was genocided. Slavs almost never have "Nov-" in their names, so Novak, Novsky, Novitsky, Novodvorsky would be Jewish surnames, especially if their bearers reside New York and have Jewish faces.
Czechs and Poles do have -ch and -sky surnames, but your rarely find a Pole in U.S., especially at MIT, so Chomsky and Minsky are not Poles.