For personal interest. This 2022 special report on hedgeweek.com says,
Cayman is domicile to over 23,000 CIVs, including about 80% of all international hedge funds
which suggests a maximum global figure of about 28,750; but so far my internet searches haven't turned up any clear statement on this.
I originally posted this question here on the money stack, but they seem not to like it.