Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Middle English oon
Old English ān (inherited)

English alone (mention)
English -o (mention)
Middle English ilkon (compound)
Middle English onen (affix)
Middle English allone (compound)
Middle English oonly (suffix)
Middle English ooneyed (affix)
Scots an (inherited)
Scots ane (mention)
Yola oan (inherited)