If he was adopted, his name is Barry Soetoro. We have no proof that he was EVER legally “Barack Hussein Obama”, even at birth.
For all we know, “Barack Hussein Obama” is a name he assumed in his “search” for his “identity as a black man”.
Well, according to one source, his white ‘girlfriend’ at Occidental is the one who told him to start calling himself Barack Obama and when he went back to Hawaii and told his grannie and his sister this...they were shocked.