Is "star Vin" used or useful at all?

[anfang]

The "star GND" configuration is used to avoid ground loops, gain RF immunity and lower resistance/inductance of the circuits.

The existence of star ground makes me wonder is there is a counterpart for the input voltage. Are "star Vin" configurations used in real-world circuits? What are they useful for?

[JPortici]

Yes.
For example, one voltage regulator outputs 3.3V. at the regulator output you have one line going to the digital  supply and another one to the analog supply, maybe with beads/inductors as an additional filter. just as with ground lines
the idea is to confine all the noise/crap into a specific path