law: Companies Act, 1956
  Sec 21    -     Change
  
  of name by company.    
  A company may, by special resolution and with the approval of
  
  the Central Government signified in writing, change its name:
  Provided  that no such approval shall be required where
  
  the only change in the name of a company is the addition thereto or, as the
  
  case may be, the deletion there from, of the word "Private",
  
  consequent on the conversion in accordance with the provisions of this Act of a
  
  public company into a private company or of a private company into a public
  
  company.