I've been aware of this name and its pronunciation for over forty years, thanks to the Scottish singer/songwriter duo Gallagher and Lyle. A track on their 1974 LP "The Last Cowboy" is titled Mhairu - different spelling, it's true, but pronounced the same. It's a delightful little number, well worth tracking down on the web.
At 20 years old, Mhairi Black is the youngest elected Member of Parliament in Britain since the 17th century. (2015).
― Anonymous User 5/8/2015
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One of Faolan's sisters in the Wolves of the Beyond series (a spin-off of the Guardians of Ga'Hoole books) by Kathryn Lasky is called Mhairie. Not spelled exactly the same, but I assume she was inspired by this name.