hiro ryuu is how you pronounce it. go to some Japanese sites to find out more!
The Japanese word for Dragon is "Ryuu"
ドラゴンストライキ
Doragonfurūtsu
Kagami Ryū
ginryu
'Kinzoku no ryuu'.
ryu no ha
ryu-ken
Doragon iki
to say dragon in Japanese is 龍 and it is read ryuu hope this helps :)
'Small dragon' would be 小さい竜 (chiisai ryuu) in Japanese.
"chi", and "ji" means blood ryu means "dragon"