Where does “сеньор” come from?

сеньор (Russian) comes from French Seigneur, from Middle French seigneur, from Old French seignor, from Latin senior, from Latin senex, from Proto-Indo-European sénos — old.

сеньор (Russian): seigneur; señor; genitive/accusative plural of...

Definitions

seigneur; señor; genitive/accusative plural of...

Ancestry of “сеньор”, step by step

сеньор traces back through two separate lines of ancestry.

via French Seigneur

Step	Language	Word	Meaning
1	French	Seigneur	Lord
2	Middle French	seigneur	lord; sire
3	Old French	seignor	lord; sire; master
4	Latin	senior	older, elder; rather old; a lord, sir; an abbot
5	Latin	senex	old, aged, elderly; old person, old man, old...
6	Proto-Indo-European	sénos	old

via Spanish señor

Step	Language	Word	Meaning
1	Spanish	señor	mister, sir, lord; gentleman; master
2	Old Spanish	sennor	lord
3	Vulgar Latin	senjor	master, elder, lord, nobleman

Every word from Proto-Indo-European sénos →Every word from Latin senex →Every word from Latin senior →