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Included in the work "Words, phrases and passages", (PE17) a compilation for TLOTR greater than that published once in "A Tolkien Compass".
Under the root SAWA-, disgusting, foul, vile.... (for the name Sauron), the professor ends with the paragraph: " Sauron's original name was Mairon, but this was altered after he was suborned by Melkor. But he continued to call himself Mairon The Admirable, or Tar-mairon (King Excellent) until after the downfall of Numenor."
So in my opinion its absolutely canonical, and really defined as his "extraoficial" real name.
Greetings
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