Originally Posted by doujyr
Doujyr - this same question came up on another tennis board earlier and to amplify what Cyclone7 said the best response from that thread was:
"Regarding Davidenko, yeah, it's Ukrainian in origin, but the -a female endings to such surnames are no longer in use, even in Ukraine. So Davidenko's female relatives' surname is also Davidenko (see: Maria Kirilenko, Alyona Bondarenko)."
There was some chatter about a year ago that Maria should change her citizenship to Ukrainian so she could play on the Fed Cup for them. But, Maria was born in Yubleigny (pardon the spelling), Moscow Oblast and is Russian Federation to the core. Somewhere in her family tree one of her ancestors moved east. During the USSR era this would have been movement within the country. Today, however, the Russian Federation is a distinct country. Interesting to note that Maria Sharapova was born in Belarus which was part of the USSR at the time but is now a soverign country.
As I think Maria would be pleased that fans from around the world want to learn more about her, here is a site on the Ukraine if you have an interest
For Sharapova fans, here is a good overview of Belarus (which my Grandparents always called "White Russia")
If any of Maria's Russian fans have clarifications or additions to the above, I for one would find it valuable to have your insights.