When first missionary folks arrived in Hawaii - one lady brought her cat ... when it got on to dry land the cat staggered trying to get it's land legs and the lady said "Poor pussycat."
Hawaiians had no cats and thought the lady was saying what the animal was and so the Hawaians call cats "Popoki." (Long first o.) At least that's the legend!
There are many words for various types of black but all kinda awkward for American tongues.
So "Popoki" and maybe "Po" or "Poki" for short?