From nna m ("my father") + dị ("lives, is alive"): "my father lives." Traditionally given to a boy born after the death of his father, grandfather or great-grandfather, believed to be that man returned. Borne by Nnamdi Azikiwe, Nigeria's first president.
Source: Igbo reincarnation naming, cross-referenced across Wikipedia (Nnamdi) and the Guardian Nigeria Igbo-names guide