| Liadain | grey lady |
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| Liadan | grey lady |
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| Lonan | blackbird |
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| Luan | moon; lion; ethics; warrior |
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| Mac | son of |
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| Mack | son of |
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| Madigan | little dog |
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| Morrissey | descendant of Muiris |
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| Muriel | of the bright sea |
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