Where does “латинъ” come from?

латинъ (Old East Slavic) comes from Latin Latīnus, from Latin -īnus, from Proto-Italic -īnos, from Proto-Indo-European -iHnos, from Proto-Indo-European -no- — adjectival suffix.

Ancestry of “латинъ”, step by step

StepLanguageWordMeaning
1LatinLatīnusLatin; of or pertaining to Latium, the Latin language, people, or culture
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 “латинъ”

Every word from Proto-Indo-European -no- →Every word from Latin -īnus →Every word from Latin Latīnus →