Open the Truecaller app
Tap the profile icon
Select Edit profile
Tap your name
Enter your new name
Save the changes
Wait for the update to reflect in Truecaller
If needed, verify your account again
Open the Truecaller app
Tap the profile icon
Select Edit profile
Tap your name
Enter your new name
Save the changes
Wait for the update to reflect in Truecaller
If needed, verify your account again