Leo does once they're inside, along with the aviators (the mask stays). He wonders if this place is like Run of the Mill pizza - though sadly not owned by a skeleton.

"Leonardo," he answers back, looking around. "But you can call me Leo or Leon."

Or really any other permutation that Six can think of! Leo has heard them all before and will answer to any of them.

"Is it normal for people to be called numbers where you come from?"