His real name, Takakiyo, is recorded in "Koya Shunju hennen shuroku" (Compilation of many spring and falls of Koya) but since "Heike Monogatari" (The Tale of Taira family) continued to use the childhood name, Rokudai, it was common to call him as 'Taira Rokudai' (In this clause, he will be referred as '(Taira) Rokudai' unless there is some issues involved).
高清という実名は高野山の歴史を記した『高野春秋編年輯録』などに記載されているが、『平家物語』が幼名の六代を用い続けているために「平六代」の名前で呼ばれるのが一般的である（本項目でも、特に断りが無い限りは「（平）六代」と表記する）。