Old Irish -as

← Proto-Celtic *-assus (inherited)

← Proto-Indo-European *-ad[[-tus]] (inherited)

→ Irish -as (inherited)

→ Irish -is (derived)

→ Irish seanchas (mention)

→ Irish feabhas (mention)

→ Manx -ys (inherited)

→ Manx kiunys (mention)

→ Old Irish testas (affix)

→ Old Irish Bretnas (affix)

→ Old Irish othrus (affix)

→ Old Irish flaithius (affix)

→ Old Irish daltus (affix)

→ Old Irish óclachas (affix)

→ Old Irish muinteras (affix)

→ Old Irish subachus (affix)

→ Old Irish cosmailius (affix)

→ Old Irish comarbus (affix)

→ Old Irish cobodlus (affix)