Who cares what 11 common mortals say (about Nam and Namu). Here's what The Supreme Votary of the Lotus Sutra says:

“And when the two characters for Namu are prefixed to Myoho-renge-kyo, or the Lotus Sutra of the Wonderful Law, we have the formula Namu-myoho-renge-kyo.” -- The Opening of the Eyes