According to the 1940 census, there was an Isador Lubin, born about 1900 in Russia and living in Brooklyn, New York, whereas Isidor Lubin was born about 1890 in Russia and living at Selwyn Avenue, Bronx, New York. Furtheron there were two Isidore Lubin living in Manhattan, and three Isadore Lubin living in Brooklyn resp. Bronx.