Namori is certainly Japanese in origin. The meaning is vague if translated directly from Japanese. Mori can mean "woods" or "grove." Na is generally used to designate a name as a prefix or suffix and it also means "name" (to ask a person what their name is, one says, "onamae wa nan des ka?") Na also means "fame" or "famed" as in something that is legendary. So it is possible that Namori could mean something like "famed grove" or something as simple as "wood."