Sherlock Holmes

Once there was an Astrologer.A friend visits the astrologer after a long time.
While they are talking, the astrologer's daughter comes and sits on the lap of the astrolger.
The friend inquires,"Who is this girl?"
The astrologer replies,"My Daughter."
The friend says, "Your daughter!! You got married, When? Too bad,you dint even invite me for the marriage? Anyways, What is the name of the girl?"
The astrologer replies, "The mother's name and the daughter's name are same"
The friend calls out correctly, "Hi Muniyamma"
How did the friend find the name of the astrologer's daughter?