How to change name after divorce back to my birth name on my iPhone

Caller ID with name is a carrier feature. Contact your cellular carrier. Some carriers will let you change this on the web site. Log into your account at your cellular carrier and see if you can modify it there.

The Outbound Caller ID is controlled by your carrier.

If you have the ability to directly manage your mobile carrier account, you might be able to configure it yourself online. (this varies by carrier)

Otherwise contact your carrier.

Depending on where this name is appearing, you may be able to do something or not.

Is this the name other people see when you all them?

Or something you see on your iPhone when you make a call?

If it something you see, then check the "My Card" contact in the Contacts app and make sure it has your name there as you want it.

If it's how others see the incoming call on their devices, then it's either down to caller ID as mentioned or because that's the name they have the number stored under in their contacts list.

They would need to edit your contact on their devices to change that. You can't directly control that.

Doubtful the device name in Settings > General > About > Name will do anything though.

Worth a try before you contact your carrier.

Tap Settings

Tap General

Tap About

Tap on Name and then tap on the "x" to delete the current name and then use the keypad to type in a new name.