Where does “Ільїн” come from?

Ільїн (Ukrainian) comes from Ukrainian -ї́н, from Old East Slavic -инъ, from Proto-Slavic -inъ, from Proto-Indo-European -iHnos, from Proto-Indo-European -no- — adjectival suffix.

Ancestry of “Ільїн”, step by step

StepLanguageWordMeaning
1Ukrainian-ї́н—
2Old East Slavic-инъ—
3Proto-Slavic-inъ-ine; Creates singulatives, mostly with...
4Proto-Indo-European-iHnosCreates adjectives of materials
5Proto-Indo-European-no-adjectival suffix

Words derived from “Ільїн”

Every word from Proto-Indo-European -no- →Every word from Proto-Indo-European -iHnos →Every word from Proto-Slavic -inъ →