Sanja

Sanja is a unisex Croatian, Serbian, and Slovene given name (used alongside Sanjin as a masculine given name in Croatia), derived from South Slavic sanjati meaning "dream", and Sanja is also used as a diminutive of Aleksandar (Croatian, Serbian), Aleksander (Slovene), and Aleksandra (Croatian, Serbian, Slovene) in the South Slavic languages, especially in Serbian. So, I think that the "Gender" of this name should be changed from "Feminine" to "Feminine & Masculine", and the "Meaning & History" section of this name should be changed to read something along the lines of, "Derived from South Slavic sanjati meaning 'dream'. It can also be a diminutive of Aleksandar, Aleksander, and Aleksandra."

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Sources: https://en.m.wikipedia.org/wiki/Unisex_name
https://forebears.io/x/forenames/sanja
https://en.m.wikipedia.org/wiki/Sanja
https://en.m.wikipedia.org/wiki/Sanja_Ilić

In Serbian, Sanja is also used as a diminutive form of Aleksandar or Aleksandra.

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Cognates with Russian Sanya.

Also Slovene: https://sl.wikipedia.org/wiki/Sanja [noted -ed]

It is also popular in Serbia. [noted -ed] Usually it is a nickname for Aleksandra or Sandra.