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    There’s also Kernighan’s Unix: A History and a Memoir for those interested in going a bit deeper.

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      Given the existence of Multics at the time, I always surmised that Unix was originally spelled Unics, and someone just changed the name to Unix. Does anyone know if there’s any truth to that?

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        Well, answering my own question it turns out I was right: “The new operating system was a single-tasking system. In 1970, the group coined the name Unics for Uniplexed Information and Computing Service as a pun on Multics, which stood for Multiplexed Information and Computer Services. Brian Kernighan takes credit for the idea, but adds that “no one can remember” the origin of the final spelling Unix.”

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        Two things struck me about this article. First that such a complex and rich history was in fact well summarised by the author. Second, I didn’t really consider, until reading the article, that what I think of generally as Unix traits had subtly different origins - the hierarchical file system and the shell coming from Multics, and pipes & standard I/O coming with early Unix (from McIlroy, if I recall correctly).

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          it may well be true that there have been no great insights into operating-system design since

          (Citation needed)

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            “may”