User:SOTO/Forum Archive/The Reference Desk/@comment-188432-20130310185635/@comment-9435571-20130803230130
From Tardis Wiki, the free Doctor Who reference
Just because the tribe was not named in the previous story doesn't mean it getting an actual name later isn't valid. There are of cases when a character wasn't named in the story they first appeared in but only got a proper name afterwards - it doesn't make the name any less valid.