O descendant of Bharata, as Rudra, that fire god, (Skanda) Svaha and the six wives (of the seven Rishis) were the cause of the birth of the great deity Skanda, so was he for that reason called the son of Rudra.
रुद्रस्य वह्नः स्वाहायाः षण्णां स्त्रीणां च भारत। जातः स्कन्दः सुरश्रेष्ठो रुद्रसूनुस्ततोऽभवत्॥