Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Old Irish -ach
← Proto-Celtic *-ākos (inherited)
← Proto-Indo-European *-eh₂kos (inherited)
← Proto-Indo-European *-eh₂ḱos (mention)
← Proto-Indo-European *-eh₂- (mention)
← Proto-Indo-European *-kos (mention)
← Proto-Indo-European *-ḱos (mention)
← Latin -ācus (cognate)
← Latin -icus (mention)
← Old Irish -óc (doublet)

→ English bog (derived)
→ English Kelleher (derived)
→ Irish cailleach (mention)
→ Irish -ach (inherited)
→ Irish -ach (inherited)
→ Scottish Gaelic cailleach (mention)
→ Scottish Gaelic -ach (inherited)
→ Scottish Gaelic laghach (mention)
→ Manx -agh (inherited)
→ Manx caillagh (mention)
→ Middle Irish -ach (inherited)
→ Scots cailleach (mention)
→ Old Irish salach (affix)
→ Old Irish mullach (affix)
→ Old Irish brónach (affix)
→ Old Irish Lochlannach (affix)
→ Old Irish sídach (affix)
→ Old Irish sídach (affix)
→ Old Irish Espáinech (affix)
→ Old Irish brécach (affix)
→ Old Irish sláintech (affix)
→ Old Irish cluichech (affix)
→ Old Irish scíathánach (affix)
→ Old Irish séissilbech (affix)
→ Old Irish -óc (doublet)
→ Old Irish gerbach (affix)
→ Old Irish marcach (affix)
→ Old Irish Sagsach (affix)
→ Old Irish cúramach (affix)
→ Old Irish substaintech (affix)
→ Old Irish Drobéssach (affix)
→ Old Irish gríbach (affix)
→ Old Irish galldach (affix)
→ Old Irish airfitech (affix)
→ Old Irish poplach (affix)
→ Old Irish gláedach (affix)
→ Old Irish gaiscedach (affix)
→ Old Irish Rómánach (affix)
→ Old Irish esach (affix)
→ Old Irish tibrech (affix)
→ Old Irish míanach (affix)
→ Old Irish brittach (affix)