On Tue, 18 Nov 1997, Adam Conover wrote:

Actually, taking -out- the 'u' is "just changing it so that it looks
better". The actual spelling -should- have an 'ou', as it's a -long- vowel
sound, but Viz decided to take them out. Why? Because they looked better.

Wrong.

There is no *right* spelling, because the word was NOT WRITTEN IN ROMAN
LETTERS ORIGINALLY.

Ukyo is correct.  Ukyou is correct.  Ukyoo is correct.

The first require knowing that the o is a long o sound.  The second and
third are the two standard ways of showing that it's a long o sound.

Ukkyo is wrong, because Japanese can actually have a double k in words,
and it's not said the same way!