Is it true that Indian Prime Minister Modi calls US President as Barack?

Is it true that Indian Prime Minister Modi calls US President as Barack?

Yes, he is probably the first one to call him by the name. No one dares to call the World's Most Powerful Man by his name.
But, why Modi did this?
Is Mr. Modi trying to challenge Obama's power by calling him with his name?
Of course, not. So let us slowly get into what the reason was.
Mr. Modi and his team might have started thinking of many new diplomatic ways, the day world's most powerful person accepted the invitation for India's Republic Day Celebration. 
Mission was for sure to present India as an evolving world power and to deepen our friendship with the United States.
So Modi had to express these feelings in the best possible way and none of the politician is as talented actor as him. Some of the things Modi did to extend the hand of friendship are as follows:
 
1. Mr. Modi hugged POTUS just like a friend as he got off from Air Force 1. This was the first element of surprise which took Obama by shock (as it is seen in the image). 

2. Modi then used the tactic which he even used in the Lok Sabha Elections, the image of chai wala. He himself served tea to Obama, which reminds me of a Bollywood movie dialogue. "Do dost ek pyali mai chai piyenge, isse dosti badti hai" (Two  friends will drink tea in same cup, it increases friendship), though they had it in different cups, but Senorita.. you know what I mean :P

3. So it is clear, that Modi made Obama his friend and a friend does not call friend's name formally. 
But, some people might argue that why he chose calling him"Barack" over "Obama". This answer was given by Modi himself in 'Mann ki Baat''.
He said that he researched over internet to find out the meaning of word 'Barack' which means 'blessed' and he used this by praising Obama (Mr. Modi never misses any opportunity to woo others), while 'Obama' doesn't mean anything.