Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
English Celt
Ancient Greek Κελτοί (mention)
Latin Celtae (mention)
Latin Celta (mention)

English Celtology (suffix)
English Celtist (suffix)
English Celto- (affix)
English Celtdom (suffix)
English Celtism (suffix)
Japanese ケルト (borrowed)