In 2018, 84 is the most common age for an American (U.S.) Francis* who is registered female with the Social Security Administration. It is the 1, 524th most common female first name for living U.S. citizens. *See Frances for the more common spelling for women.
― Anonymous User 10/12/2018
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In 2018, 59 is the most common age for an American (U.S.) Francis who is registered male with the Social Security Administration. It is the 338th most common male first name for living U.S. citizens.
― Anonymous User 10/5/2018
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"Francis" is masculine, while "Frances" is feminine.
I agree with others that, by convention, "Francis" is male and "Frances" is female. I had a male friend named, "Francis," and he would quip, "Dot that 'i'," to emphasize his name was the masculine form.
The name Francis is primarily used as a Masculine name and Frances is used as a Feminine name.
Francis is sometimes used as a Feminine name as a rare variant of Frances but it's NOT very common.
https://www.behindthename.com/name/francis/top/united-states?compare=frances
https://www.behindthename.com/name/francis/top/england-wales?compare=frances
https://www.behindthename.com/name/francis/top/australia-nsw?compare=frances
Following a similar style, Francisco is a popular Masculine name in the USA and Francesca is a popular Feminine name from the 70s onwards.
Francisca is also used in the USA until it stopped using mainly in the 50s.
Francesco is NOT a popular name in the USA.
https://www.behindthename.com/name/francisco/top/united-states?compare=francesca%20francesco%20francisca
https://www.behindthename.com/name/francisco/top/england-wales?compare=francesca%20francesco%20francisca
Other countries are subject to their own variations (Like Francesco being popular in Italy as a Masculine name and Francisca being popular as a Feminine name in Latin America and Brazil).
https://www.behindthename.com/name/francesco
https://www.behindthename.com/name/francisca
https://forebears.io/forenames/francesco
https://forebears.io/forenames/francisca