Eden was totally buried by the Flood of Noah and there is no way we can know its location under all the miles of dirt and rock on top of it now!
It makes spiritual sense, inasmuch as we can understand, that it would be below where Israel is now, but we really won't know until Jesus comes again and we can ask Him!
In the meantime, just as New York was named for York, in England, and New Hampshire for Hampshire, and places like Christchurch in New Zealand for the other, it would be normal and natural for Noah and his sons to name the rivers of their new world after the rivers of the old.