You don't. I just say loads of random sounding words and end it with 'o'
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The Silence, Judoon, Ood, Slitheen and Max Capricorn.
Loads - in fact he's had too many. The list is almost endless, so I can't list them all here. His worst enemy is the Daleks, but there are also other enemies such as the Cybermen, the Zygons, the Sontarans, the Master and his less well-known enemies included aliens like the Slitheen and Judoon, who are much recent. The writers always add new enemies every other series or so, so it is impossible to count all of them.
If you are referring to the ninth Doctor in Doctor Who, then the answer is Christopher Eccleston.
Colin Baker played the Doctor in 1993; however, the Doctors name is literally always the Doctor.
1st Doctor: William Hartnell 1963-19662nd Doctor: Patrick Troughton 1966-19693rd Doctor: Jon Pertwee 1970-19744th Doctor: Tom Baker 1974-19815th Doctor: Peter Davison 1982-19846th Doctor: Colin Baker 1984-19867th Doctor: Sylvester McCoy 1987-19968th Doctor: Paul McGann 19969th Doctor: Christopher Eccelston 200510th Doctor: David Tennant 2005-200911th Doctor: Matt Smith 2010-?