Catalan llum

← Spanish lumbre (cognate)

← Proto-Indo-European *léwksmn̥ (inherited)

← Proto-Indo-European *lewk- (mention)

← Latin lūmen (inherited)

← Occitan lum (cognate)

← Old Occitan (inherited)

→ Catalan cuca de llum (mention)

→ Portuguese lume (cognate)