Where does “Akhenaten” come from?

Akhenaten derives from Egyptian ꜣḫ-n-jtn, a name composed of the Egyptian root ꜣḫ, meaning "effective" or "beneficial."

Ancestry of “Akhenaten”, step by step

Step	Language	Word	Meaning
1	Egyptian	ꜣḫ-n-jtn	—
2	Egyptian	ꜣḫ	akh; ghost, spectre, spirit of the dead...