Mirella

Also Polish, as mentioned before:

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https://www.behindthename.com/name/mirella/top/poland
https://dane.gov.pl/pl/dataset/1667,lista-imion-wystepujacych-w-rejestrze-pesel-osoby-zyjace/resource/54110/table?page=1&per_page=20&q=Mirella&sort=

Apparently also used in Greece: https://en.wikipedia.org/wiki/Mirella_Papaeconomou (spelled Μιρέλλα)
You'll find numerous bearers on social media.

Also the Finnish form: https://www.nordicnames.de/wiki/Mirella

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Also the Hungarian form: https://www.behindthename.com/name/mirella/top/hungary

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Also a Spanish variant: https://www.ine.es/widgets/nombApell/index.shtml?L=1

Also Finnish name. Finnish name day April 30.
https://fi.wikipedia.org/wiki/Mirella
https://almanakka.helsinki.fi/en/name-days/name-day-search.html

Apparently also occasionally used in Slovene: https://sl.wikipedia.org/wiki/Mirella

Also Polish: https://pl.wikipedia.org/wiki/Mirela -- mention Mirella as a variant
https://pl.wiktionary.org/wiki/Mirela --- mention Mirella as a variant

Also Hungarian: http://www.nytud.hu/oszt/nyelvmuvelo/utonevek/osszesnoi.pdf
You'll find numerous bearers on social media.

Also used in Hungary. Pronounced: MI-rel-law.

Quite commonly used in Finland as well.