Luisa

Also German:

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https://www.beliebte-vornamen.de/4666-louisa.htm
https://de.m.wikipedia.org/wiki/Luisa_(Vorname)
https://www.behindthename.com/name/luisa/top/germany
https://www.behindthename.com/name/luisa/top/austria

The standard Polish form of this name is Luiza, or Ludwika, but Luisa has also been in use. Last year (2021) 6 baby girls were named Luisa, and 2 got it as a middle. As of January this year, 314 women in Poland have this name. Last year, 225 women had it as their middle name.

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/Mevina_Puorger -- Luisa Famos.
Https://sursassiala.ch/2015/01/15/familienforschung/
Https://nossaistorgia.ch/entries/A39DB2bJDNY
Https://www.portraitarchiv.ch/portrait?page=62
Http://www.annalas.ch/persunas/display/q:Luisa

This is number #998 on US popularity charts.
2019.

Also Banatswabian: https://ofb.genealogy.net/famreport.php?ofb=zichydorf&ID=I13987&nachname=Kostka&modus=&lang=de
https://ofb.genealogy.net/famreport.php?ofb=zichydorf&ID=I16723&nachname=Schuster&modus=&lang=de

Also Croatian: https://actacroatica.com/en/name/Luisa/

Also Sardinian: https://sc.wikipedia.org/wiki/Pizente_de_Paul -- santa Luisa de Marillac
https://it.wikipedia.org/wiki/Prenomi_sardi#M

Also Corsican: http://www.corsicami.com/corse%20prenoms/prenoms_corses_m03.htm

Also occasionally used in Romania. You'll find bearers on social media.

Also occasionally used in Estonia: https://et.wikipedia.org/wiki/Luisa

In 2018, 4 is the most common age for an American (U.S.) Luisa who is registered female with the Social Security Administration. It is the 2, 166th most common female first name for living U.S. citizens.

Also rare Croatian usage.

The name Luisa was given to 178 baby girls born in the US in 2012.

Luisa is also Czech and Slovak form.

Also used in Romania.

This name is really popular in Germany. Louisa is popular, too.