Shavian ˈʃeɪviən, for the writer George Bernard Shaw, is more recent (OED: 1905). And Fitzrovia, for the area around Fitzroy Square near Euston, is a mere half-century old (OED: 1958).
(Do you think anyone would give Waugh an adjective Wavian? No? Neither do I.)
I spoke too soon. The word had already been coined and used. In a review of Alexander Waugh’s book Fathers and Sons: the autobiography of a family, Christopher Hitchins wrote
If students of George Bernard Shaw can be called Shavians, a friend of Evelyn Waugh’s named John Sutro argued, then those interested in all things Waugh might be called Wavians. I now realize that, without knowing it, I have been a Wavian for many years.
The review is dated June 3, 2007.
Another review, by Barbara Kay, dated June 13, 2007, bore the headline Parental neglect: the Wavian muse.
In November 2007 there was even a punning headline, Wavian goodbye.
Let me update my question. In years to come, when someone writes a biography of our Justice Secretary, Jack Straw, will his views and behaviour be called Stravian?
Or we might reverse the process and start calling birds aws. (Think about it.)