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It seems to me that something that's a couple of lightyears out can't have any sort of stable orbit. I suppose that an Oort cloud essentially merges with an adjacent star's so there's no hard definition.

At the point of merger with neighboring stars it’s likely that circular orbits are unstable.

Judging by our own solar system it’s likely that the distance at which circular orbits are stable is a question of relative mass, and time.

> there's no hard definition.

Yes. All human definitions are imperfect.

> https://en.wikipedia.org/wiki/Oort_cloud

The distances between the planets fit nicely on a log scale.

Do other systems have oort clouds or are their’s also something we cant see from this far

The only physical evidence we have they exist are comets that occasionally show up in the inner solar system where we could observe them which have orbits that are not interstellar but would put them as going incredibly far out. From that we can extrapolate that they likely exist around every star but there is no way we could verify that with our current technology since any light reflected off the objects would be far too faint to detect.