Again, Volodymyr, you've not read /understand what I've written. Tamerlane has specifically asked for a Russian name, if he wanted to keep his English name, then he wouldn't have to change his name (read the title of this thread).
I don't know what you mean about "everyone putting everything into English these days", that's a very vague statement and doesn't seem to refer to anything anyone's said in this post.
In fact your whole last post doesn't make sense.
And regarding your grandpa from Ukraine; I'm not sure if I've understood you right, but having one grandparent who is Russian (was he actually Russian and not Ukrainian?) doesn't make you "definately Russian". That would make you 1/4 Russian, unless you have additional Russian heritage from other grandparents.