Nathan In Yiddish is NISEL (like Shabat - Shabes) The Family Name Niselovich - Sons of Nathan.
Abraham Feinberg indicated to his son Jonathan that Nathan had changed his name to Feinberg upon disembarking from the boat in Baltimore and having been met by an uncle/ cousin who had come previously whose name was Feinberg. This relative told Nathan that he couldn't have a name like Niselovich in the New World