“UX managers come with all sorts of fancy-pants titles. This isn’t about titles. This is about responsibilities. The core difference between a UX manager and the staff of a UX team is the responsibilities she holds. (…) Someone who manages user experience has stuck their neck out and said they’ll deliver business outcomes through improving the experience that customers have with a product or service. That doesn’t mean soft results like better user testing results, that means delivering the things businesses ultimately care about: adoption, growth, revenue, retention, and margins.”
UX team lead or UX champion would be a better label.