Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Old Irish to-
← Proto-Celtic *tu- (inherited)

→ Irish teastaigh (mention)
→ Irish tarlaigh (mention)
→ Irish taifead (mention)
→ Irish téaltaigh (mention)
→ Scottish Gaelic teagaisg (affix)
→ Scottish Gaelic tairg (affix)
→ Scottish Gaelic tàrlaidh (mention)
→ Old Irish do (mention)
→ Old Irish turcbál (affix)
→ Old Irish dobeir (affix)
→ Old Irish dobeir (affix)
→ Old Irish dofuissim (affix)
→ Old Irish domuinethar (affix)
→ Old Irish dotuit (prefix)
→ Old Irish dotuit (mention)
→ Old Irish tánaise (affix)
→ Old Irish gataid (affix)
→ Old Irish doaidlea (affix)
→ Old Irish doairbir (affix)
→ Old Irish doáirci (affix)
→ Old Irish doáirci (affix)
→ Old Irish doairicc (affix)
→ Old Irish doboing (affix)
→ Old Irish docuirethar (affix)
→ Old Irish dofich (affix)
→ Old Irish doformaig (affix)
→ Old Irish doléici (affix)
→ Old Irish domeil (affix)
→ Old Irish doscara (affix)
→ Old Irish torbae (affix)
→ Old Irish dofuiben (affix)
→ Old Irish doadbat (affix)
→ Old Irish duaisilbi (affix)
→ Old Irish doclaid (affix)
→ Old Irish toschith (affix)
→ Old Irish doinóla (affix)
→ Old Irish doecmalla (prefix)
→ Old Irish doaig (affix)
→ Old Irish doinfet (affix)
→ Old Irish doeclainn (affix)