Iris

The name Iris has a usage of Roman Mythology. So, I think that the usage of Roman Mythology should be added to the "Usages" section.

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Sources: https://en.wikipedia.org/wiki/Iris_(mythology) (Messenger of the gods)

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

Also Croatian: https://actacroatica.com/en/name/Iris/ [noted -ed]

Also Hebrew this name is sometimes used in Israel.
I have even more examples :
https://he.wikipedia.org/wiki/%D7%90%D7%99%D7%A8%D7%99%D7%A1_%D7%90%D7%99%D7%A8%D7%99%D7%A1%D7%99%D7%94_%D7%A7%D7%95%D7%91%D7%9C%D7%99%D7%95

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https://he.wikipedia.org/wiki/%D7%90%D7%99%D7%A8%D7%99%D7%A1_%D7%9C%D7%A2%D7%90%D7%9C

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https://he.wikipedia.org/wiki/%D7%90%D7%99%D7%A8%D7%99%D7%A1_%D7%90%D7%9C%D7%99%D7%94_%D7%9B%D7%94%D7%9F

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https://he.wikipedia.org/wiki/%D7%90%D7%99%D7%A8%D7%99%D7%A1_%D7%91%D7%A8

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https://he.wikipedia.org/wiki/%D7%90%D7%99%D7%A8%D7%99%D7%A1_%D7%A9%D7%98%D7%A8%D7%9F_%D7%9C%D7%95%D7%99

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https://he.wikipedia.org/wiki/%D7%90%D7%99%D7%A8%D7%99%D7%A1_%D7%A4%D7%A8%D7%95%D7%A9

Iris (with this spelling) is also a Portuguese given name, used alongside Íris in Portuguese. And, Iris is also sometimes used as a masculine given name in various languages, such as Portuguese (especially Brazilian Portuguese) and English, albeit very rarely. Some known male bearers of this name are Iris DeBrito (a Brazilian footballer), and Donnie Iris (an American musician).

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Sources: https://en.m.wikipedia.org/wiki/Iris
https://en.m.wikipedia.org/wiki/Iris_(given_name)
https://en.m.wikipedia.org/wiki/Iris_DeBrito
https://en.m.wikipedia.org/wiki/Donnie_Iris
https://forebears.io/forenames/iris

Also Slovene: https://sl.wikipedia.org/wiki/Iris_(ime) [noted -ed]

Also Estonian: https://et.wikipedia.org/wiki/Iris_(eesnimi)

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

Also Italian.

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In 2018 were born in Italy 442 Iris, the highest number since national statistics (1999). This makes Iris the #87 most used feminine name for newborns in 2018.

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In Italy it is pronounced EE-rees. [noted -ed]

Also Catalan: http://www.idescat.cat/noms/?q=Iris&lang=en.

In 2018, 3 is the most common age for an American (U.S.) Iris who is registered female with the Social Security Administration. It is the 759th most common female first name for living U.S. citizens.

Way more popular in Finland and Portugal, and with a different and even uglier sound.

Hurricane Iris of 2001 was the most destructive hurricane in Belize since Hurricane Hattie in 1961. Iris was the second-strongest storm of the 2001 Atlantic hurricane season, behind Hurricane Michelle.

Also Modern Greek. Irida is the variant form, written Ιριδα. [noted -ed]

I was called Iris Ann in the 50's after my mother who was Iris Mary, born in the 20s. She was called Iris as she was born at home in June, when Irises were growing in the garden and her grandmother suggested it would make a lovely name. I didn't know anyone else called Iris when I was growing up. The girls at school were Barbara, Christine, Linda and Lynn. I felt very miserable about having such a name for many years. Now in my 60s, I'm glad to have the name Iris. My mum always called me Iris Ann - I miss that. Hello to all you lovely ladies called Iris!

The form "Iiris" has been more common in Finland since the forties.

Another interesting thing about the name Iris is that backwards, it is Siri. A fresh twist on a classic name, and great for twins.

Iris is relatively common in Sweden. It was trendy in the 1910's and 20's. Now it is becoming popular again, in 2008 it ranked # 81 for newborn girls. Iris has a name day on February 10th.

Also used in Spain and Spanish-speaking countries. Iris would be pronounced ee-rees.

Used in Spanish. [noted -ed]

Also used in France. [noted -ed]

Also a feminine name in Slovenia.

Also used in Portuguese as Íris. [noted -ed]