Where does “uno” come from?

uno (Bikol Central) comes from Spanish uno, from Old Spanish uno, from Latin ūnus, from Old Latin oinos, from Proto-Italic oinos, from Proto-Indo-European óynos — one; single.

Ancestry of “uno”, step by step

Step	Language	Word	Meaning
1	Spanish	uno	one
2	Old Spanish	uno	one
3	Latin	ūnus	one, single
4	Old Latin	oinos	one
5	Proto-Italic	oinos	cardinal number 1 Previous: n/a Next: *duō;...
6	Proto-Indo-European	óynos	one; single

Every word from Proto-Indo-European óynos →Every word from Proto-Italic oinos →Every word from Old Latin oinos →