'Noble' comes from Latin 'gnoscere' (to know) — a noble person was simply one who was 'known.'
Belonging to the aristocracy; having high moral qualities or ideals; impressive in appearance or quality.
From Old French 'noble,' from Latin 'nōbilis,' meaning 'well-known, famous, of high birth,' an older form of which was 'gnōbilis,' from the root 'gnōscere' / 'nōscere' (to know, to become acquainted with), from Proto-Indo-European *ǵneh₃- (to know). A 'noble' person was originally one who was 'known' — famous, recognised, distinguished. The connection between being known and