4 Nephi 1:37

therefore the true believers in Christ, and the true worshippers of Christ, (among whom were the three disciples of Jesus which should tarry,) were called Nephites, and Jacobites, and Josephites, and Zoramites.

So the true believers and worshipers of Christ were called Nephites, Jacobites, Josephites, and Zoramites. The three followers of Jesus who would stay on earth were among them.

So all the true believers and worshipers of Christ—including the three disciples who would never die—went by these names: Nephites, Jacobites, Josephites, and Zoramites.