Welsh heb

← Proto-Celtic *sekʷo (inherited)

← Proto-Indo-European *sekʷ- (root)

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

← Old Irish sech (cognate)

→ Breton hep (cognate)

→ Welsh heibio (affix)

→ Welsh heblaw (affix)

→ Irish seach (cognate)