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Why did Tutankhaten change his name to Tutankhamun?

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Sculpted head of Akhenaten, ancient Egyptian pharaoh, with elongated facial features and a tall, ornate headdress, displayed at the Alexandria National Museum. — Akhenaten Akhenaten, sculpture in the Alexandria National Museum, Egypt.

Tutankhaten changed his name to Tutankhamun around his third regnal year as part of a broader effort to abandon the religious reforms of his predecessor, Akhenaten.12

During the reign of Akhenaten, traditional Egyptian religion and the cult of the god Amon had been set aside in favor of the Aten. Upon taking the throne as a child, the young king—guided by influential officials such as the vizier Ay and the general Horemheb—moved the capital to Memphis and issued a decree to restore the temples, images, and privileges of the traditional gods.321

By changing his name to Tutankhamun and his queen’s name to Ankhesenamen, the king signaled a formal return to the old religious order and the restoration of Amon as a central deity of the empire.142