As opposed to what wrote the person to whom you replied, the origin of that name is not quite clear. It should be of Greek origin, but why Nika, from the Doric form Νίκα? One would expect Niki, the (modern and also fairly ancient) pronunciation of the Attic form Νίκη. I think Ocean has to enlighten usAs I wrote in an earlier post, Nika for a boy is very rare in Germany. You hear far more often Niko/Nick/Niklas instead of Nika when it comes to boys names. Nika is almost always a nickname for a girl in Germany, the male version exists, but is rarely used.
In Romance languages (except French) a word ending in -a most often implies feminine gender, but not in Russian. Sasha stands for Aleksandra as well as for Aleksandr. But it seems that Nika is unknown in Russian, Nikita, Niko, Kolya... are used, but not Nika. So we again need Ocean's help.Even gender neutral names often are used differently in various nations. For instance in Germany when you hear the name "Sascha" you expect a male and with "Nikita" a female (their male/female forms are used too, but only rarely), there are nations were this is inverted. Or in Italy "Andrea" is a male name, whereas in Germany "Andrea" is a female name. "Andreas" is the male version.