No exciting find for the general public, only for me.  Alfred Appel  mentions it, albeit rather succintly whereas this malicious condensation of links struck me as an absolute source of wonder...
 
The Annotated Lolita, on page 406 (Penguin) Appel notes:
207/2 Pim...Pippa: an allusion to the play Mr. Pim Passes By (1919), by A.A.Milne ( 1882-1956), and to Browning's Pippa Passes. See also Keys, p.20. See 117/2 for another reference to Pippa Passes, and Pale Fire, p.246.
 
And yet, in his next note on the "Dublinois" theme, Appel develops the "Ormonde" ( hotel Ormond and Ulysses and James Joyce's "hors [de ce] monde". 
He doesn't inform that both Browning and Milne  were also "Dubliners".
 
Another correction: In A.Christie's "A Murder is Announced" the equivocal character is not called Pippa, but Pip ( short for Philippa).
 
----- Original Message -----
From: jansymello
To: Vladimir Nabokov Forum
Sent: Sunday, November 09, 2008 3:06 PM
Subject: Re: [NABOKV-L] QUERY: Aunts and orphans..an exciting find (maybe)
VN's direct mention to Pippa: " She watched the listless pale fountain girl put in the ice, pour in the coke, add the cherry syrup — and my heart was bursting with love-ache. That childish wrist. My lovely child. You have a lovely child, Mr. Humbert. We always admire her as she passes by. Mr. Pim watched Pippa suck in the concoction:"J'ai toujours admiré l'œuvre du sublime Dublinois."[...]
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