Old Irish derc

← Proto-Celtic *derkos (inherited(sga/mga))

← Proto-Celtic *derkos (inherited)

← Proto-Celtic (inherited)

← Proto-Indo-European *derḱ- (derived(sga/mga))

← Proto-Indo-European *derḱ- (root)

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

← Proto-Indo-European *dʰreh₂ǵ- (derived)

→ Scottish Gaelic dearc (inherited)

→ Middle Irish derc (inherited)