shoyteh

The Tora Temimah in Parshas Shemos (Vayikach es Bas Levi) brings the Zohar: Before a marriage sge is called “Bas Ploni after marriage, eishes ploni”. The idea of being “called” bas ploni is equivelant to a last name as we find Moshe was called “ben Amram” as a pejorative by his detractors much like you owuld call someone by their last name to belittle them.