Where does “Mazdeanism” come from?

Mazdeanism (English) comes from English Mazdean, from English ean, from Middle English enen, from Old English ēanian, from Proto-West Germanic gaaunōn, from Proto-Germanic aunōną, from Proto-Indo-European h₂egʷnós, from Proto-Indo-European -nós — Creates verbal adjectives from roots.

Ancestry of “Mazdeanism”, step by step

StepLanguageWordMeaning
1EnglishMazdeanOf or pertaining to Mazda, the Zoroastrian deity;...
2EnglisheanTo bring forth young; to yean
3Middle EnglishenenTo give birth; to yean
4Old Englishēanianto give birth (to lambs)
5Proto-West Germanicgaaunōnto lamb, yean
6Proto-Germanicaunōnąto lamb, yean
7Proto-Indo-Europeanh₂egʷnóslamb
8Proto-Indo-European-nósCreates verbal adjectives from roots
Every word from Proto-Indo-European -nósEvery word from Proto-Indo-European h₂egʷnósEvery word from Proto-Germanic aunōną