The Lotus Sūtra has seventeen alternative names. All Buddhas in the past, present and future, however, name it “Namu Myōhō Renge Kyō.” Various Buddhas such as Amida (the Buddha of Infinite Life) and Śākyamuni meditated on the truth of “3,000 existences contained in one thought in mind and recited “Namu Myōhō Renge Kyō” by mouth while performing the bodhisattva practices until they became the Enlightened Ones.

Jisshō-shō, A Treatise on the Ten Chapters of the Great Concentration and Insight, Writings of Nichiren Shōnin, Doctrine 2, Page 4