Drawing a line in the sand! Elon Musk’s 18-year-old transgender daughter has just filed legal documents to declare her gender identity — AND to legally change her first and last name so she has nothing to do with her dad anymore!

Wow! In documents filed in LA County and obtained by TMZ on Monday, the teen, born Xavier Musk, is now asking to be known as Vivian Jenna Wilson.

The last name comes from her and her twin brother Griffin’s mom, Justine Wilson, who was married to the Tesla founder from 2000 to 2008.