Shiva Purana
तत्सुतो पुष्पनामा हि ध्रुवसंज्ञस्तदात्मजः॥ अग्निवर्णस्सुतस्तस्य शीघ्रनामा सुतस्ततः ॥ २७॥
His son was Puṣyanāman. His son was Dhruva. Agnivarṇa was his son. His son was Śīghra.
english translation
tatsuto puSpanAmA hi dhruvasaMjJastadAtmajaH॥ agnivarNassutastasya zIghranAmA sutastataH ॥ 27॥
hk transliteration by Sanscript