Jana 1

Also English:

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https://www.behindthename.com/name/jana-1/top/united-states
https://en.m.wiktionary.org/wiki/Jana

Also the Romansh feminine form of Romansh Jan:
https://nossaistorgia.ch/entries/nBLD8BL0ZA8

Jana is also Latvian. The name day for Jana in Latvia is December 15. [noted -ed]

Also a Bulgarian variant transcription of Яна (Yana).
You'll find numerous bearers on social media.

Also an Estonian variant of Jaana: https://et.wikipedia.org/wiki/Jana_(eesnimi) [noted -ed]

Also Sorbian: https://hsb.wiktionary.org/wiki/Jana.

The name Jana was given to 299 girls born in the US in 2016.
More than 99.9 percent of people with the first name Jana are female.

Also rare Bulgarian usage.

This name is also occasionally used in English-speaking countries, where it's usually pronounced JAY-na.

The name is also used in Iceland.

Jana is also used in Catalan as a diminutive of Joana.

Jana is the most ordinary and most boring Czech name ever! Totally run-of-the-mill.
I have never understood why, for God's sake, so many parents give their baby-girls this name.
Czech pronunciation is YAH-NAH.

Jana is in 24th place in Top 1000 in Czechia. It was borne by 492 little girls (2006-2007).
Website: http://www.mvcr.cz/sprava/informat/cetnost/index.html

It's a very common Czech name. Pronounced YAH-nah. Nothing special, boring. But it usually fits to every surname. I'm glad that my cousin was named earlier than me so I got another name. :)

In Poland we don't use this feminine form of masculine name "Jan". It sounds a bit artificial for the Poles. [noted -ed]

Contrary to one of the comments above, this name IS used in Poland, even if it's rare.
In 1994, there were 119 women registered with this name (source: Kazimierz Rymut, Słownik imion współcześnie w Polsce używanych). In 2015, sixteen girls were named Jana (ranked #175 along with Adriana and Stella).