"But the author that interested me most was naturally Sirin"

Nabokov concludes his autobiography with yet another fine example of his boundless self-esteem: V.Sirin was the young Vladimir Nabokov's pseudonym when he lived in Berlin and contributed to the émigré paper Rul'.

Later on, in Look at the Harlequins!, the main character Vadim Vadimych, who bears a close resemblance to the author, adopts the pen name "V.Irisin", almost an anagram of V.Sirin.