Deryck Whibley Name Change -- Avril Lavigne's Ex-Husband Is Free From Her Name

Sum 41 singer Deryck Lavigne Whibley has officially erased Avril Lavigne from his life, and ... more importantly, his signature -- a judge just granted his name change.

The rocker’s request to drop Avril's name was stamped on Thursday. As we first revealed, Whibley had secretly taken her name during their 2006 marriage ... to become Deryck Jason Lavigne Whibley. Deryck's name change was filed a few months after Lavigne married Nickelback frontman Chad Kroger ... which is probably not a coincidence. The fact Deryck has a new fiancée probably influenced the change too.