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Irish -ach
← Proto-Celtic *-ākos (inherited)
← Proto-Celtic (inherited)
← Proto-Celtic (mention)
← Welsh -og (cognate)
← Irish -óg (doublet)
← Irish -each (alter)
← Irish (alter)
← Irish slender form (alter)
← Irish -achán (link)
← Irish -achas (link)
← Proto-Indo-European [[*-eh₂kos|*-eh₂kos, *-eh₂ḱos]] (inherited)
← Proto-Indo-European *-éh₂ (mention)
← Proto-Indo-European [[*-kos|*-kos, *-ḱos]] (mention)
← Old Irish -ach (inherited)
← Old Irish -ach (inherited)

→ English Kelleher (mention)
→ Welsh -og (cognate)
→ Irish salach (affix)
→ Irish tuirseach (affix)
→ Irish dúch (affix)
→ Irish Albanach (affix)
→ Irish boireannach (affix)
→ Irish beathach (affix)
→ Irish gruagach (affix)
→ Irish maiseach (affix)
→ Irish Ioslamach (affix)
→ Irish millteach (affix)
→ Irish biorach (affix)
→ Irish Sasanach (affix)
→ Irish Éireannach (affix)
→ Irish leatromach (affix)
→ Irish adharcach (affix)
→ Irish bacach (affix)
→ Irish adhartach (affix)
→ Irish bláthach (affix)
→ Irish brónach (affix)
→ Irish bratach (affix)
→ Irish ógánach (affix)
→ Irish seileach (affix)
→ Irish scamallach (affix)
→ Irish gaothach (affix)
→ Irish Seiceach (affix)
→ Irish Lochlannach (affix)
→ Irish aisteach (affix)
→ Irish gaiscíoch (affix)
→ Irish gairmeach (affix)
→ Irish cothromach (affix)
→ Irish feamnach (affix)
→ Irish ceannasach (affix)
→ Irish luachrach (affix)
→ Irish misteach (affix)
→ Irish Danmhargach (affix)
→ Irish bodach (suffix)
→ Irish catach (affix)
→ Irish bunúsach (affix)
→ Irish feidhmeannach (affix)