How did Sophia Loren get her name?

Sophia Loren was born Sofia Costanza Brigida Villani Scicolone.

In 1951, she appeared in Italian film Era lui... sì! sì! where she played an odalisque, being credited professionally as Sofia Lazzaro. She appeared in several bit parts and minor roles in the early part of the decade. She began using her current stage name in La Favorita (1952), the new name being a twist on the name of the Swedish actress Märta Torén and was suggested by Goffredo Lombardo or (according to the 2008 DVD) Carlo Ponti.