> According to the Oxford dictionary the definition of the word "privy" in Privy Council is an obsolete one meaning "Of or pertaining exclusively to a particular person or persons; one's own",[3] insofar as the council is personal to the sovereign.

* https://en.wikipedia.org/wiki/Privy_Council_of_England#Name

Yep, you’re right. I was mixing it up with Groom of the Stool.