im korean, not japanese, but im pretty sure 'shiro' means 'white' and 'hoshi' means star. so maybe its shiro hoshi.
黒い星 /ku roi ho shi/ would be the translation. As a title/name, ブラックスター /bu ra-kku su taa/ would be the Japanese spelling (like the character from Soul Eater manga/anime series).
Burūsutā
Kuroi Hoshi
'Hoshi.'
hikaru
its kuro
if you mean shooting star its nagare boshi
kokuchou
kuroji
kuroari
kuroikokoro
Kurotsuki
Kokushibyou
Kuro Aisu=Black Ice
Kuroi sora is black sky.