Where does “-un-” come from?

-un- (English) comes from Latin unus, from Old Latin oinos, from Proto-Italic oinos, from Proto-Indo-European óynos — one; single.

Ancestry of “-un-”, step by step

StepLanguageWordMeaning
1Latinunusone, single; alone; one; 1
2Old Latinoinosone
3Proto-Italicoinoscardinal number 1 Previous: n/a Next: *duō;...
4Proto-Indo-Europeanóynosone; single
Every word from Proto-Indo-European óynos →Every word from Proto-Italic oinos →Every word from Old Latin oinos →