The words praskaṇva and hariścandra are formed by suṭ meaning the two Rishis of that name.,
Thus प्रस्कण्व ऋषिः, हरिश्चन्द्र ऋषिः ॥ The word हरिश्चन्द्र could be formed by 6.1.151 in the Mantra, here it refers to other than Mantras. When not referring to Rishis, we have प्रकण्वो देशः, (कण्वं पापं तत्प्रगतं यस्मात्) हरिश्चन्द्रो मानवकः (हरिः चन्द्रो यस्य मुग्धस्य)॥,