Keazor was born in Obosi, Eastern Nigeria (in what is now Anambra State) on 7 July 1907, to  Ikeazor Uba Oboli I, a local chief and early convert to Christianity in Obosi.
kˈiːzɚ wʌz bˈɔːɹn ɪn ɑːbˈoʊsi, ˈiːstɚn naɪdʒˈiəɹɪə ɪn wʌt ɪz nˈaʊ ˈænæmbɹə stˈeɪt ˌɔn sˈɛvən dʒuːlˈaɪ nˈaɪntiːnhˈʌndɹɪd sˈɛvən, tʊ ˈaɪkæzɚ jˈuːbə ˈɑːbɑːli ˈaɪ, ɐ lˈoʊkəl tʃˈiːf ænd ˈɜːli kənvˈɜːt tə kɹˌɪstɪˈænᵻɾi ɪn ɑːbˈoʊsi.