Oscar

Also Romansh.
Source: "Vornamen in der Schweiz. Prénoms en Suisse. I nomi in Svizzera. Prenoms in Svizra" (1993) published by the Association of Swiss registrars
https://rm.wikipedia.org/wiki/Oscar_Peer
https://nossaistorgia.ch/entries/Y2vV5XpvZe3
https://www.portraitarchiv.ch/portrait?page=96

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

Just to say that the popularity statistics can’t really be compared.
In Denmark all spellings of the same name have be merged. For instance all Oscar + all Oskar = third place as of 2019. In Norway and others both Oscar and Oskar are on the popularity list.

Also Galician: http://www.ige.eu/igebdt/esq.jsp?idioma=gl&ruta=onomast/nomes.jsp
https://gl.wikipedia.org/wiki/Lista_de_nomes_masculinos_en_galego

Add Usage: German

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Pronounced: OS-kar (Italian), AWS-ka (Swedish), OS-ga (Danish), AWS-kar (German, Dutch)

Oscar is also used in Spain.

In 2018, 4 is the most common age for an American (U.S.) Oscar who is registered male with the Social Security Administration. It is the 407th most common male first name for living U.S. citizens.

Also used in French. [noted -ed]

This name would be a perfect girl name.

According to the Italian Wikipedia, this name is also used in Italy, in this form. Italian variants include Oscare, Oscarre, Oscher, and Oscardo, and masculine diminutives include Oscarino and Oscherino. The Italian feminine form is Oscara, with the diminutive Oscarina. The Italian name day is February 3, being associated with the 9th-century Saint Ansgar/Anskar/Anschar, Archbishop of Hamburg-Bremen, who died on that day.
[noted -ed]

Also a French name. In France, Oscar is the name the students give to the skeletons in medical schools.

In CATALAN it is like in Spanish, but with an accent on the letter O: ÒSCAR.