Old Irish derb

← Old English trīewe (cognate)

← Proto-Celtic *derwos (inherited)

← English true (cognate)

← Proto-Indo-European *drewh₂- (derived)

← Proto-Indo-European *dóru (mention)

→ Irish deirfiúr (affix)

→ Irish dearbh (inherited)

→ Irish deartháir (mention)

→ Irish dearbh- (mention)

→ Scottish Gaelic dearbh (inherited)

→ Manx jarroo (inherited)

→ Manx jarroo-vraar (mention)

→ Old Irish derbráthair (prefix)

→ Old Irish derbsiur (prefix)

→ Old Irish derb- (mention)

→ Old Irish derbfine (prefix)