I call it "Sir Hat" too, and I can tell you what made me read it like that: the author/owner is 'Sir_Cmpwn on HN.
The name for the specefic website is sr.ht (Sir hat) [0] but the name of the software is Sourcehut.
[0] https://drewdevault.com/2018/11/15/sr.ht-general-availability.html
Re:Sourcehut Q1 2019 financial report
by sergiotapia on Wednesday May 15, 2019 @03:38PM
(#19922951)
He called it sir hat somewhere in the show hn thread so I've been calling it that too.
Sourcehut makes more sense.