The name kaylee is too girly for a pop rock singer like Avril lavigne?

Avril Lavigne's birth name is Avril Ramona Lavigne. Her stage name is Avril Lavigne. People often have stage names that are different from their birth names. This is common in the entertainment industry. There is no evidence that Avril Lavigne has ever gone by the name Kaylee.

The name "Kaylee" is not inherently too girly for a pop rock singer. There are many successful female pop rock singers with similar names, such as Hayley Williams of Paramore and Taylor Momsen of The Pretty Reckless. Ultimately, it is up to the individual artist to decide what name they want to use professionally.