What Is Legos's Last Name?

This is rampant in the in the pub quiz community. All i had to do was google legalus last name to see if i could get to the bottom of this. The first thing that came up was the lord of the rings, sub readed jimminy. But even though i'm defending you here, you know what answer they were looking for. They weren't playing riddles in the dark,. as in the hobbit, where gallam breaks the rules and gives two answers.