Leon

Also Czech:

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https://cs.m.wikipedia.org/wiki/Leon_(jm%C3%A9no)
https://www.behindthename.com/name/leon/top/czech

Also used in Albanian: https://instatemra.shinyapps.io/emra/

Also Greek [noted -ed], Russian and Ukrainian: https://forebears.io/forenames/leon

Also Swedish, Norwegian, Finnish and Danish: https://www.nordicnames.de/wiki/Leon

Also Judeo-Anglo-Norman: http://heraldry.sca.org/names/jewish.html

Also Afrikaans: https://af.wikipedia.org/w/index.php?search=Leon&title=Spesiaal:Soek&profile=advanced&fulltext=1&searchengineselect=mediawiki&ns0=1

Also a common diminutive of Leonid.

This name is not French? Sounds like it can also be used in France.

Also Gascon, Provençal and Languedocian: https://ieo-oc.org/spip.php?page=article&id_article=290 --- Source: Institut d'Estudis Occitans

Also Breton: https://br.wikipedia.org/wiki/Leon_(anv-badez)

Also Occitan: https://fr.wikipedia.org/wiki/Liste_des_pr%C3%A9noms_occitans (Source: Institut d'études occitanes)
https://oc.wikipedia.org/wiki/Leon_C%C3%B2rdas

In 2018, 60 is the most common age for an American (U.S.) Leon who is registered male with the Social Security Administration. It is the 485th most common male first name for living U.S. citizens.

Also a popular boys name in Croatia. [noted -ed]

Although it is currently enjoying steady popularity in Scandinavia and in the British Isles, it is actually more popular in Germany than any of those other areas. In the United States, however, it is considered to be in the same category as Elmer, Mortimer, Lester, Irving, and Wilbur in terms of being much less common today than it was a century ago.

Also a masculine name in Slovenia. [noted -ed]