How did the Tokyo name came from and what is the meaning of behind it?

Question:

I have two question here

1) As mentioned above

2) Kyoto was used to be capital of Japan last century. Why did the capital changed to Edo during historical period?

Thanks for answering.

Best asnwer will chosen.

Ganbate!!

Answer:

Some posters above brought up a very interesting question:
Was Edo the capital city of Japan despite the fact that Emperors kept residing in Kyoto (it was called "Kyo" back then) throughout the Edo Period?

I would say "Yes, Edo was the capital city of Japan." Because:
1) Although there was no definition of "capital city" in Japan back then, all the political power and bureaucratic functions were concentrated in Edo where the Tokugawa Shogunate was placed.
2) Throughout the 264-year Edo Period, The Emperors did not have any political power over the Shogunate, local Daimyos and people in Japan.
3) It is fully understandable that Edo was renamed Tokyo (eastern Kyo), considering the fact that the Meiji government was established by restoring the power of the Emperor.