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Re:Sibyl: Google’s System for Large Scale Machine Learning by klipt on Sunday August 31, 2014 @08:47PM (#8251046)
Sybil in mythology just means "oracle", so that's probably the inspiration in both cases:

http://en.wikipedia.org/wiki/Sibyl

Re:Sibyl: Google’s System for Large Scale Machine Learning by 1c4050b09 on Monday September 01, 2014 @10:08AM (#8252866)
Without giving too much away (it's a rather good series, and the reveal is pretty well done), it also might have to do with the book Sybil about Shirley Mason

https://en.wikipedia.org/wiki/Sybil_(book) https://en.wikipedia.org/wiki/Shirley_Ardell_Mason