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To change your name on Allegiant Airlines, you'll need to contact their Customer Support Team directly at +1855-6260-090 (OTA).

They will guide you through the process and inform you of any

documentation requirements or fees associated with the name change.

https://community.expensify.com/discussion/28096/changing-passenger-name-on-allegiant-airlines-what-you-need-to-know-for-name-changing/p1?new=1