caballero
/kabaˈʝeɾo/ · A1 · noun · m
gentleman
🐴 caballo (horse) + -ero (one who) = horse-man, hence knight, gentleman
From Late Latin caballarius, a horse rider. Owning a horse marked rank, so the word rose from rider to knight to gentleman. English cavalier and chevalier are the same word via Italian and French.