It is incredible that these were given so meaningful Sanskrit names, which match what Sri Aurobindo says about them in the Life Divine Chap X !! This is a late discovery but relevant. These Sanskrit names are supposed to be meaningful. They were the subject of a talk given by Sri Aurobindo in Chandernagore ... see from chandernagore to pondicherry "The whole noon used to be devoted [by Sri Aurobindo] to the teaching of yoga. I still can recollect a discussion about the divine principle, enmeshed in a quadruple sheath. He discoursed ecstatically2 about Vasudeva, Sankarshan, Prodyumna and Aniruddha, and I listened with rapt attention." the footnote is amusing When this passage was read out to Sri Aurobindo in 1940, he commented: “I didn't know I had any emotion during explanation.” (Nirodbaran, Talks with Sri Aurobindo, vol. III (Pondicherry: Sri Aurobindo Ashram Trust, 1973), p. 68.