In Saran's Amarkkalam, the lead character's name is Vasu. This is possibly a nod to ___________

K. Balachander's Ek Duuje Ke Liye, in which also the male protagonist was called Vasu.

P.S.:- This is an observation on my own (or internalized from some interview of Saran that I had seen). If I am wrong, please keep the brickbats low. :)