Surnames

Q: Is it permissible for a woman to change her surname to that of her husband or can she keep her father's first name after marriage?

Q: I am not married. I would like to change my surname. Is this permissible?

Q: I am a revert to islam and would like to know which verse of the Holy Quran or Hadith says that a revert should retain his surname (my surname is not the name of an idol or such)? And does my wife take my surname or keep her fathers surname?

Q: Is it true that if a person does not take their father's name (female) even after marriage, they will be denied the fragrance of Jannah?