To change your name with Spirit Airlines, contact their customer service by phone or visit the website. Provide proof of your name change, such as a marriage certificate or legal document. Fees may apply, and it’s best to make changes well before your flight date to avoid issues.
Source: https://idashelteringla.com/en-US/forums/general-discussion/a8fa2338-c0a1-ef11-95f5-000d3a31f983
