[wtn]

I was going to snarkily say that they named their database after PostgreSQL's mascot, but then I remembered that Hadoop also has an elephant logo.

[zmitri]

there's also a CL db named elephant http://common-lisp.net/project/elephant/

[Klinky]

and the unofficial PHP elephant: http://www.flickr.com/photos/laughingsquid/2218075860/