They refused to change their name as this was attack on their dignity and religion; it was their dignity or self-respect that made them refuse this suggestion of name change.
nsari (Arabic: انصاری) is a Nesbat used in the Middle East and South Asia. It originates from Ansar (Arabic: انصار), the Medinan people that helped Islamic prophet Muhammad when he migrated from Mecca to Medina. The literal meaning of Ansar is "supporters".