Question: why naruto uzumaki not namikaze?
Answer: The changing of the name was done by the Third Hokage, Hiruzen. ... So for Naruto's own protection, they change his name from Namikaze to Uzumaki, because no one except for Jiraiya, Hiruzen, his wife Biwako, and Tsunade knew about the marriage of Kushina Uzumaki and Minato Namikaze.