Edit: Seems like this particular combination is not unique after all. Found quite a few people of the same name. Perhaps they chose a victim which can't be found trivially.
It says they're taken from the Instagram account of "a Russian personal trainer".
I doubt the author is making an ethnic distinction between European Russians and Turkic Kazakhs, so the woman is probably identifiably located inside Russia.
Really? What kind of structure do their names have? I think even cultures that used full-sentence names tended to have some conventional ones.
And certain name ideas are very common cross-culturally, as witness Bogdan / Nathaniel / Theodore (and older Diodorus / Apollodorus / Herodotus / etc) / Dieudonné / Atallah...
Going to something I know better, Chinese names can be unique, and I know someone who tells me her father specifically attempted to ensure that nobody shared her name, but I wouldn't go as far as saying that being unique is the typical case. Some names (小丽, 国强) have an attractive meaning and are used with identical spelling by large numbers of people; other names (Xīnyuè, Sījiā) show a lot of spelling variation while always being pronounced identically.
Typically names consist of 1-5 elements which can be combined arbitrarily. There are literally thousands of such elements though.
Last name often is a first name of an ancestor a few generations deep and it is likely to be unique too.
So as a result first+last name combinations are quite unique.
Urbanization is changing all this of course but some traditions are still strong. In my entire life I've met just 3 people with the same first name as mine.
Out of curiosity, are those elements meaningful or just pure sounds?