Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Middle 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)
← Middle Irish -óc (doublet)
← Old Irish -ach (inherited)

→ Scottish Gaelic slaodach (mention)
→ Middle Irish corrach (affix)
→ Middle Irish Albanach (affix)
→ Middle Irish bachlach (affix)
→ Middle Irish Saxanach (affix)
→ Middle Irish Saxanach (affix)
→ Middle Irish túathach (affix)
→ Middle Irish fésócach (affix)
→ Middle Irish scréchach (affix)
→ Middle Irish scíathach (affix)
→ Middle Irish prísúnach (affix)
→ Middle Irish dóendachtach (affix)
→ Middle Irish saigtech (affix)
→ Middle Irish comgarach (affix)
→ Middle Irish reithinech (affix)
→ Middle Irish míanach (affix)
→ Middle Irish clocach (affix)
→ Middle Irish deoradach (affix)
→ Middle Irish sanusach (affix)
→ Middle Irish ainmidech (affix)
→ Middle Irish longportach (affix)