Where does “ⲁⲑⲁⲛⲁⲥⲓⲟⲥ” come from?

ⲁⲑⲁⲛⲁⲥⲓⲟⲥ (Coptic) comes from Ancient Greek ἀθανάσιος, from Ancient Greek ἀθάνατος, from Ancient Greek ἀ-, from Proto-Hellenic hə-, from Proto-Indo-European sm̥-, from Proto-Indo-European sem- — together, one.

Ancestry of “ⲁⲑⲁⲛⲁⲥⲓⲟⲥ”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ἀθανάσιος	immortal
2	Ancient Greek	ἀθάνατος	undying, immortal; everlasting, perpetual;...
3	Ancient Greek	ἀ-	The alpha privativum, used to make words that...
4	Proto-Hellenic	hə-	same; together
5	Proto-Indo-European	sm̥-	one; with, together
6	Proto-Indo-European	sem-	together, one

Every word from Proto-Indo-European sem- →Every word from Ancient Greek ἀ- →Every word from Proto-Indo-European sm̥- →