ɪt wʌz nˈeɪmd sˌoʊ bɪkˈʌz ɪɾ ɪz ɐn ˈaɪsəlˌeɪɾᵻd kˈɔːɹəl ˈaʊtkɹɑːp; sˈʌtʃ ˈaʊtkɹɑːps wɜː nˈoʊn æz nˈɪɡɚhˌɛdz baɪ bɹˈɪɾɪʃ sˈeɪlɚz.
It was named so because it is an isolated coral outcrop; such outcrops were known as niggerheads by British sailors.