Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Old Irish ad-
Proto-Celtic *ad- (inherited)
English at (cognate)
Proto-Indo-European *h₂éd (derived)
Latin ad (cognate)

Irish aibí (mention)
Irish adhnáireach (mention)
Irish adhnáire (mention)
Irish adhfhuath (mention)
Irish adhnua (affix)
Irish adhmhaidin (mention)
Irish adhmhill (mention)
Irish adhmhol (mention)
Scottish Gaelic abaich (mention)
Scottish Gaelic tairg (affix)
Manx appee (mention)
Middle Irish abaid (mention)
Old Irish in- (mention)
Old Irish adora (affix)
Old Irish ammus (affix)
Old Irish álaind (derived)
Old Irish dobeir (affix)
Old Irish attá (affix)
Old Irish adgládathar (affix)
Old Irish adágathar (affix)
Old Irish adbar (prefix)
Old Irish adcobra (prefix)
Old Irish adcomla (affix)
Old Irish adcosnai (affix)
Old Irish adcota (affix)
Old Irish adcota (mention)
Old Irish tánaise (affix)
Old Irish adannai (affix)
Old Irish adella (affix)
Old Irish adfét (affix)
Old Irish adfét (mention)
Old Irish adgair (affix)
Old Irish admidethar (affix)
Old Irish adrig (affix)
Old Irish adtreba (affix)
Old Irish doáirci (affix)
Old Irish foácaib (affix)
Old Irish adamrae (affix)
Old Irish asagúsi (affix)
Old Irish adnoí (affix)