Double Overhand, like what SS369 said.
Yes, indeed he did say that; it's a strange name
to use for the shown knot, though --not my idea
of a
"double overhand"!?
Yes, it's a boring solution, but it's also simple, quick, utilitarian, and probably just as good as any fancier knot for this application. It won't jam at this load if you use a thick enough cordage. It will jam in something like monofilament. Even if it does jam, I imagine you're using some type of cheap cordage you can replace without a care.
1) How is an eyeknot the solution to this problem
(or is it to be ring-loaded (which makes it an end-2-end
knot))? Are there to be two of them --one each for the
brush & hook?
2) If anything, jamming is desired and will need to be
achieved in setting : we're hanging paint brushes with
short bits of cordage --it's not like one is going to untie
and re-use a bunch of little bits of cord!
3) NotSure is on the right track, but I wouldn't trust
such a solution of the (so to speak) "split
fisherman's knot"
--I tried something similarly clever and (in my case) in
fact TOO clever (by half), and saw my camera drop to
the road I was cycling along (it survived). OOPS

Well, it's all a matter of materials --size & stiffness &
slickness (or not); at the size NotSure shows, it's like
to jam nicely with a good setting and give the "hoop"
for easy hooking (assuming a rather stiff cord).
(I keep finding my mind wandering off in search of
some blood-knot-like wrapping to secure the eye end
as though it was rigid, but I won't try to illustrate those
adventures. And for quick'n'dirty, the
fisherman's knotwill suffice in cord that might be so thin as to nearly let
the knot fit through the hole.)
--dl*
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