Hey Nina, congrats on the rebrand! It would be great to run a launch campaign to drum up excitement for the change. For example, you could:
Share some behind-the-scenes content on the process for how / why the name was changed (e.g. a blog post)
Run a contest for members to win some swag branded with the new program name
Do some social media spotlights under the new program banner (bonus points if you can get some of your friendlies on board to share why they're excited for the new name and feature them in the spotlight)