It's gorgeous in French, but not usable outside of Francophone areas, unfortunately. A lot of people would likely butcher it as mir-AYL or something. :-(
The Italian variant
Mirella would likely be easier to use, instead. And among Hispanic / Latino communities,
Mireya is somewhat popular.
My personal favorite variant is actually the original Occitan,
Mireio; but that one's an even taller order than
Mireille.
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