Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Scottish Gaelic ma
Breton mar (cognate)
Proto-Celtic *mā (inherited)
Proto-Celtic *ma (mention)
Proto-Indo-European *meh₂ (inherited)
Cornish - (cognate)
Old Irish (inherited)

Scottish Gaelic nan (link)