Manx agh

← Proto-Celtic *extos (inherited)

← Proto-Celtic *ekʷos (inherited)

← Proto-Indo-European *eǵʰs (inherited)

← Proto-Indo-European *h₁éḱwos (inherited)

← Old Irish acht (inherited)

← Old Irish ech (inherited)

→ Manx treeheelagh (compound)

→ Manx tree straihagh (prefix)

→ Manx neuphussagh (affix)