Here's why:
* AP is a Welsh prefix, not a title: It means "son of" and is often used in Welsh surnames. For example, "Ap Rhys" means "son of Rhys."
* Welsh names follow specific patterns: If a surname is already formed with "Ap," it's usually a traditional Welsh name that wouldn't be further modified.
* Modern usage: While "Ap" is still common in Welsh surnames, it's not typically added to existing names in modern times.
Therefore, it's highly unlikely that you would see "AP" used before a Welsh last name.
If you're unsure about the proper form of a Welsh name, it's always best to consult a reliable source of information or a native Welsh speaker.