WordPress releases are codenamed after well-known jazz musicians, starting after version 1.0. The latest and greatest version of the WordPress software — 3.3, named “Sonny” in honor of the great jazz saxophonist Sonny Stitt.

 

Jazz based names for WordPress version releases
With thanks to Infographiclabs for an awesome infographic.


More information from WordPress about the “Sonny” release: