In 2018, 58 is the most common age for an American (U.S.) Nancy who is registered female with the Social Security Administration. It is the 39th most common female first name for living U.S. citizens.
― Anonymous User 10/5/2018
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Another (probably less common) variant not currently listed is NANCE. [noted -ed]
https://www.behindthename.com/name/nancy/top/brazil
https://www.behindthename.com/name/nancy/top/spain-decade
https://www.behindthename.com/name/nancy/top/quebec
https://www.behindthename.com/name/nancy/top/france
https://forebears.io/forenames/nancy