Catalan ahir

← Spanish ayer (cognate)

← French hier (cognate)

← Proto-Indo-European *dʰǵʰyes- (derived)

← Proto-Italic *hezī (derived)

← Latin herī (inherited)

← Occitan ièr (cognate)

← Old Occitan (inherited)

← Old Catalan hir (inherited)

→ Catalan abans-d'ahir (compound)

→ Occitan ièr (cognate)