( The DH in this name is pronounced like a hardened sound of 'th'in 'thus'. )
( See also the link Karna1 and Sootha1.)
Raadha was the wife of a Sootha named Adhiratha who was one of the charioteers of Dhritharaashtra. She was foster mother of Karna. But, as the world did not know about Karna's real identity, everybody believed that Karna was the son of a sootha.
"After praying to Naaraayana, Nara, Sarasvathi and Vyaasa, then one should read the Jayam."
DEDICATED TO MY DEAR NIECE VYSHNAVI KRISHNA