law: The Foreigners Act, 1946
  5. Change of name. -
  (1) No foreigner who was in India on the date
  
  on which this Act came into force shall, while in India after that date, assume
  
  or use or purport to assume or use for any purpose any name other than that by
  
  which he was ordinarily known immediately before the said date.
  (2) Where, after the date on which this Act
  
  came into force, any foreigner carries on or purports to carry on (whether
  
  alone or in association with any other person) any trade or business under any
  
  name or style, other than that under which that trade or business was being
  
  carried on immediately before the said date, he shall, for the purposes of
  
  sub-section (1), be deemed to be using a name other than that by which he was
  
  ordinarily known immediately before the said date.
  (3) In relation to any foreigner who, not
  
  having been in India on the date on which this Act came into force, thereafter
  
  enters India sub-sections (1) and (2) shall have effect as if for any reference
  
  in those sub-sections to the date on which the Act came into force there were
  
  substituted a reference to the date on which he first enters India thereafter.
  (4) For the purposes of this section -
  (a)  the
  
  expression name includes a surname, and
  (b)  a name shall
  
  be deemed to be changed if the spelling thereof is altered.
  (5) Nothing in this section shall apply to the
  
  assumption or use -
  (a)  of any name
  
  in pursuance of a license or permission granted by the Central Government; or
  (b)  by any
  
  married woman, of her husband's name,
  Comments
  Section 5 contemplates that a foreigner while
  
  in India shall not change or use any name other than the name by which he was
  
  known previously without the permission of the Central Government. If a
  
  foreigner has lawfully changed his name and comes to this country it cannot be
  
  said he is committing an offence under Section 5(3). (AIR 1968 Madras 349)