Where does “Al·lecto” come from?

Al·lecto (Catalan) comes from Ancient Greek Ἀληκτώ, from Ancient Greek ἄληκτος, from Ancient Greek ἀ-, from Proto-Hellenic hə-, from Proto-Indo-European sm̥-, from Proto-Indo-European sem- — together, one.

Ancestry of “Al·lecto”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Ἀληκτώ	Alecto, one of the Erinyes
2	Ancient Greek	ἄληκτος	unceasing
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- →