The Irish ancestry of Anna Patterson's husband Tom Costello sparked the name of this search engine, which the company states, is taken from a series of Celtic folklore stories involving a character, Fion mac Cumhaill, they erroneously refer to as Finn _____. The company says that X is Irish for knowledge and hazel. Identify X.
CUIL, the search engine. Business Week adjudged CUIL to be the one of the most successful startups of 2008
P.S : Deepak again :)