Irish tiubh

← Proto-Celtic *tegus (inherited)

← Scottish Gaelic tiugh (cognate)

← Manx çhiu (cognate)

← Proto-Indo-European *tegus (inherited)

← Old Irish tiug (inherited)

→ Irish tiús (suffix)

→ Irish tiubhaigh (affix)

→ Scottish Gaelic tiugh (cognate)

→ Manx çhiu (cognate)