Spirit Airlines’ name change policy allows passengers to make changes to their booking, but only under certain circumstances. If the name correction is due to a minor error (such as a typo), Spirit typically allows a correction for free. However, if a passenger needs to change their name (such as due to marriage or legal name change), they must contact Spirit Airlines’ customer service, and fees may apply.
https://www.toursntravelpro.com/name-change-policy/spirit-airlines-name-change-policy/