[C Of K]

If he has a considerable amount of dialogue, you might want to reconsider not giving him a name in the first book.

If he doesn't have considerable dialogue in the first book, when you get to the second book, you can have one of your more important characters recall him from the first book.

EDIT: But even if he doesn't have considerable dialogue in the first, if not giving him a name has become a problem, then you should give him one, in my opinion.