Вот что интересного прочитал в Википедии:
Цитата:
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It has been asserted that the name Meriadoc could be in itself an allusion to the British nobleman Conan Meriadoc, legendary founder of the House of Rohan in Brittany,[9] since the character Meriadoc is closely associated with Tolkien's kingdom of Rohan.
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Правда, источника для этой теории нету.