| Manning | monk |
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| Mannix | a little monk |
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| Marmaduke | devotee of Maedoc |
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| Mayo | yew-tree plain, unique |
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| Mcafee | son of Duibhshíth |
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| Mccoy | fire |
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| Merrigan |
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| Mo | bitter |
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| Moira | bitter; beloved; drop of the sea |
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