I don't know for sure but if I had to guess I would say that the I.E.
root is *e:ik- "to be master of, possess". It has the suffix -var
which alternates with -van- as in Av. isvan- "lord".
-David
--- In cybalist@..., "S.Kalyanaraman" <kalyan97@...> wrote:
> How about i_s'a (i_s'vara) with a long 'i' ? E.g. i_s'a_va_sya
> upanis.ad