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To change your name on your Frontier Airlines profile, log in to your account on their website. Access the "Profile" or "Account Settings" section, edit your personal information, and update your name. Remember that updating your profile name may not automatically change it on existing bookings. For specific reservations, contact Frontier Airlines' customer support. Ensure accuracy and provide any necessary documentation for the name change process.

https://www.airtripsadvisor.com/frontier-name-change/