It is a tradition in India for women to use their husbands' names after marriage. But not necessarily. While Sonam K Ahuja (Earlier Sonam Kapoor) opted to use her husband's surname at celebrity Astro-Numerologist Sanjay B Jumaani's behest, Preity G Zinta also added her husband, Gene Goodenough's initial 'G' on his suggestion.
On the other hand, newlywed Deepika Padukone's name adds to a readymade number '1' (Sun) that stands for Leadership. Adding an 'R', 'Ranveer' or 'Singh' to her name would distort the numerical vibrations.
She is already blessed with a well-crafted name and hence does not need Sanjay B Jumaani or Yoginath to alter her name! Therefore, Sanjay B Jumaani recommend her to stick to the original name 'Deepika Padukone' so as to rise and shine like the Sun she's governed by!