Companions
Are you seriously telling me that you gave a toss about something as silly as names? You swanned off in a magical box with a man called the Doctor, who thinks "John Smith" is a perfectly fine alias to use.
A person doesn't go for months on end without an identity for shits and giggles. So, like I told Magambo and Malcolm and Ross and every single person that has ever asked me who I was: wrong words, timelines, boom. There was too much at risk just to give you a name that would mean nothing to you, and everything to UNIT.
Exactly. The big Bad Wolf that gobbles up little girls lost in the forest.