Where does “Latin” come from?

Latin (Old English) comes from Latin Latinus, from Latin -inus, from Proto-Italic -īnos, from Proto-Indo-European -iHnos, from Proto-Indo-European -no- — adjectival suffix.

Ancestry of “Latin”, step by step

Latin traces back through two separate lines of ancestry.

via Latin Latinus

StepLanguageWordMeaning
1LatinLatinusLatin; of or pertaining to the Latin language,...
2Latin-inusOf or pertaining to; -ine
3Proto-Italic-īnosof/belonging to
4Proto-Indo-European-iHnosCreates adjectives of materials
5Proto-Indo-European-no-adjectival suffix

via Latin latinus

StepLanguageWordMeaning
1LatinlatinusAlternative letter-case form of Latīnus; Latin;...

Words derived from “Latin

Every word from Proto-Indo-European -no-Every word from Latin -inusEvery word from Proto-Italic -īnos