The meaning of the name Erech dated back to the time before the foundation of Gondor, and had long been forgotten by the end of the Third Age. Tolkien does note in his letters that he may have been influenced by the Elvish element er-, 'one, lone' in choosing the name, but the full meaning is lost to history. (See The Letters of J.R.R. Tolkien, No. 297, dated 1967.)
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