Can I use my last name in my music career if it’s trademarked?

It depends. For example, what is sold with the trademark, and for how long? Are you 14 or 50, and how long have you played professionally?

Trademark Office Action: How to respond

How to Respond to a Tradmark Office Action

A trademark office action starts a legal proceeding. How and what to say is vital to overcome the trademark rejection and get your mark registered.