Just a note Lugubrious, Midna wouldn't know Navi's name.

The backstory I had written for Navi after the events of Ocarina of Time had Princess Zelda banish Navi from Hyrule and strike her name from the records of the hero (its mentioned in my last post) in some of the more obscure Hero of Time legends there would be mention of a fairy that accompanied Link but her name would never be put down and I don't believe that the Twili should have any record of it. The only people that would know Navi's name are the ones who were physically there during the events of OOT.