Where does “econym” come from?

econym (English) comes from English oikonym, from English -onym, from Ancient Greek ὄνυμα, from Ancient Greek ὄνομα, from Proto-Indo-European h₁nómn̥, from Proto-Indo-European h₃neh₃- — to name.

Ancestry of “econym”, step by step

Step	Language	Word	Meaning
1	English	oikonym	A type of toponym denoting a settlement or its...
2	English	-onym	name; word
3	Ancient Greek	ὄνυμα	Doric and Aeolic form of ὄνομᾰ
4	Ancient Greek	ὄνομα	name; fame; noun, in the wide sense: referring to...
5	Proto-Indo-European	h₁nómn̥	name
6	Proto-Indo-European	h₃neh₃-	to name

Every word from Proto-Indo-European h₃neh₃- →Every word from Proto-Indo-European h₁nómn̥ →Every word from Ancient Greek ὄνομα →