he Doctor's name nobody knows, not even the writers. That's why it's a whisper because the writers haven't discussed it. If they give that away, then Doctor Who won't be as mysterious so you won't really have to watch.
In one of the episodes of the "Keys to time" series, a former school chum calls Tom Baker "Theta Sigma." The Doctor sheepishly tries to silence him while looking back & forth at the camera & his chum. Classic Tom Baker style.
His real name is given in "Unfinished Business" series of online Doctor #9. It is:
Chrístõdavõreendiamondhærtmallõupdracœfiredelúnmiancuimhne de Lœngbærrow -
- Chrístõ to his friends.
Another of his names his chritaéroõdesmaérãtoru. IT is pronouced (cri_est_t_o) but the rest of his name his gobbledegook that cannot be pronouced. Although it cannot be pronounced there will be an episode of Doctor Who where it will be announced but that episode is in the 6th series
Nobody knows his real name. He is known by everybody as 'The Doctor' or just 'Doctor'. He is also known as 'boss' by Mickey Smith.

No one really knows, his nickname at the acadamy was Theta Sigma, Davros calls him the destroyer of worlds, the Daleks call him the Oncoming storm

Maybe he has a really dull name like Keith

Maybe his name is Bob

I think the Doctors name will be something a little more exotic then keith or margery, mabey its something he knows humans wont be able to pronounce so he just uses doctor for quickness...

well i guess we wont ever know so we should keep guessing and forget the mystery