In 2018, 86 is the most common age for an American (U.S.) Jennie* who is registered female with the Social Security Administration. It is the 735th most common female first name for living U.S. citizens.*as a first name, not a nickname.
― Anonymous User 10/5/2018
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The name Jennie was given to 74 girls born in the US in 2015.
*as a first name, not a nickname.