Elle

As of January this year, 18 women in Poland are named Elle. 11 others have it as their middle.

Elle is not a standard Polish name, however it's had a little usage in recent years. Last year (2020) 2 baby girls were given this name as a first name. None got it as a middle name. In January of this year, 16 women in Poland had this name as a first name and 7 had it as a middle name. Quite a bunch of other English -Elle names have also been in mostly sparse use.

Also Finnish name. Finnish name day February 10.
https://fi.wikipedia.org/wiki/Elle_(nimi)
https://almanakka.helsinki.fi/en/name-days/name-day-search.html

I labeled this comment "other" because it's sort of about a famous bearer, but a different spelling.

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Though the character on "Stranger Things" is called El (nickname for Eleven), I wouldn't doubt it if she has contributed to Elle's rising popularity, particularly in the United States.

Deriving ultimately from Helena, Elle has become an independent form in Estonian. Since there are no such things as silent letters in Estonian, unlike in French it is pronounced "Ell-eh". Both E-s sound the same, like the e in "exit".