Irish dual

← Old English tæġl (cognate)

← Proto-Celtic *doklos (inherited)

← English tail (cognate)

← Irish dualach (link)

← Irish dualach (link)

← Irish dualbhata (link)

← Proto-Indo-European *doḱlos (inherited)

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

← Icelandic tagl (cognate)

← Old Irish dúal (inherited)

← Old Irish dúal (inherited)

→ German taugen (cognate)

→ Irish dualeolaíocht (affix)