The man himself answers... but you probably won't like it :-)
http://www.roesler-ac.de/wolfram/acro/credits.htm#12
The meaning of the i in i-node
From: dmr@plan9.bell-labs.com (Dennis M. Ritchie)
To: wolfram@roesler-ac.de
Date: 06 Apr 2001
I don't remember the discussion, but probably "index".
I can't recall a time when it was expanded out. The
name was always just i-node.
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