Where does “gentilician” come from?

gentilician (English) comes from English ān, from Middle English ān, from Old English ān, from Proto-West Germanic ain, from Proto-Germanic ainaz, from Proto-Indo-European óynos — one; single.

Ancestry of “gentilician”, step by step

gentilician traces back through two separate lines of ancestry.

via English ān

StepLanguageWordMeaning
1Englishān
2Middle Englishāna, an indefinite article
3Old Englishānlonely; entirely alone, solitary, single; one
4Proto-West Germanicainone
5Proto-Germanicainazone; some
6Proto-Indo-Europeanóynosone; single

via Latin gentilicius

StepLanguageWordMeaning
1Latingentiliciusbelonging to a particular Roman gens; tribal,...
2Latin-icius-itious
3Latin-icusbelonging to; derived from; of or pertaining to;...
4Ancient Greek-ικόςof or pertaining to, in the manner of; -ic
5Ancient Greek-κόςforms adjectives with the sense of 'of or...
6Proto-Indo-European-ḱos-y, -ic
Every word from Proto-Indo-European óynosEvery word from Proto-Germanic ainazEvery word from Proto-West Germanic ain