Onah is a Nigerian surname. Notable people with the name include:

Adoga Onah (born 1940), former Nigerian Ambassador whose diplomatic postings included Sweden, the Philippines, and the United States Anthony Onah, Nigerian-American film director, screenwriter, and producer Chukwuebuka Onah (born 2000), Nigerian footballer Godfrey Onah, Nigerian Catholic prelate Julius Onah (born 1983), Nigerian-American filmmaker Rose Onah, Nigerian academic and public administrator

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