How do you pronounce black sun in Japanese?

There are of course Japanese Words for 'black', 'rose' and 'dragon', but the Yu-Gi-Oh monster 'Black Rose Dragon's Japanese name is actually in English.

They gave it a name using English Words which can be first romanised into Japanese phonetics - 'Burakku Rōzu Doragon', and then into Japanese kana - 'ブラック・ローズ・ドラゴン'

You could say something like 'Kurorōzu no Ryu' but that isn't the name Black Rose Dragon would be known by in Japan.