This line is called the Brooklyn Variation of Alekhine's Defense:
[FEN ""] 1.e4 Nf6 2. e5 Ng8!?
How did it get its name?
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The power of a Google search reveals: from https://en.wikipedia.org/wiki/Alekhine%27s_Defence#Brooklyn_Variation
2...Ng8, undeveloping the knight immediately, was named the "Brooklyn Defence" in honour of his hometown by GM Joel Benjamin, who calls this his "pet line".
Provided reference: Joel Benjamin, American Grandmaster: Four Decades of Chess Adventures, Gloucester Publishers, 2007, p. 167. ISBN 978-1-85744-552-7.