Where does “Костянтин” come from?

Костянтин (Ukrainian) comes from Latin Constantinus, from Latin -īnus, from Proto-Italic -īnos, from Proto-Indo-European -iHnos, from Proto-Indo-European -no- — adjectival suffix.

Ancestry of “Костянтин”, step by step

StepLanguageWordMeaning
1LatinConstantinus
2Latin-īnusof or pertaining to; -ine
3Proto-Italic-īnosof/belonging to
4Proto-Indo-European-iHnosCreates adjectives of materials
5Proto-Indo-European-no-adjectival suffix

Words derived from “Костянтин

Every word from Proto-Indo-European -no-
Костянтин — Etymology, Origin & Word History | Etymology Explorer