As discussed in this QnA, the name "Shravana Kumara" (श्रवणकुमार), as is genrally captured in our popular imagination, is not actually found in the Valmiki Ramayana based recensions. The old couple killed by Dasharatha are just referred to as parents of some Hermit Boy, without any mention of the name - "Shravana Kumar".
I'd like to know the origin of the name "Shravana Kumara". Which scriptures mention it?
Further, I remember listening in a Srimada Bhagvatam Katha paṇḍāl (मंडप),
the prologue to Shravana Kumara's story,
whence his shudra mother and vaishya father maintained an illicit relationship with each other, and thus committing adultery with their respective spouses and also breaking the varna-ashrama dharma, set forth by the great Manu. And thus on the order's of the Aja, (the then King of Ayodhaya & Shri Rama's grandfather), they were adjuciated for an exile outside the country along with, sentenced to be blinded for their crimes. In the exile, the two surrendered themselves to the Lord, and were blessed with a boy. The boy being highly devoted to his parents, he got married but the wife although propitious towards her husband, was ill-willed for her in-laws, leading Shravana Kumara to abandon his wife and set forth on a pilgrimage journey with his parents. This is where the main incidents of the "popular story", involving Dashratha occured.
Are there any scriptures that give some reference to the above mentioned story of Shravana Kumar's parents?*