Are you wondering how much Turkish Airlines is flexible with a name change? Name changes of all flight tickets are managed under Turkish Airlines name change on ticket. In accordance with the rules of this policy, all the travelers are required to have correct names on their tickets, same as on their IDs and other documents. Turkish Airlines allows name change/correction from 4 letters upto a full name. If the traveler has requested a name change within 24 hours of purchase the airline wouldn’t be charging any fee for the same. However, name changes or corrections are only allowed till the time of check-in, no correction requests will be taken in after that. In case a passenger has recently got married or divorced, they may change their last names after providing legal documents such as marriage certificates, court orders, and so forth, for the verification purpose.
For more info: https://www.travomonk.com/name-change/turkish-airlines-name-change-policy/