Board Thread:Naruto Discussions/@comment-3279282-20150424165656/@comment-945885-20150425135022

Seelentau wrote: mitsuki means three months or literally three moons. It can also mean appearance, but I don't think that's important.

And well, a mysterious boy looking like a young Toneri... come on, if there's no connection, it would be weird. There are a lot of other readings for the name. The first that came up in my dictionary was 光月, basically "Shining Moon."