I've never heard of Mirielle only Mireile. Nice.
Elyse is definitely too close to
Elle.
Lucienne is nice and easier to pronounce than Mirielle, I think. Plus,
Lucie is vey easy to say.
How about
Marguerite,
Nathalie,
Josephine,
GEnevieve,
Marcelle,
Pauline,
Paulette?
Three boys nappin', one mama namenerdin'
To peruse my top 100ish names:
http://www.behindthename.com/pnl/82589
"My Inner Birthing Mother Paddles a Canoe" and other non-name musings
found on my blog:
http://jodifriesen.blogspot.ca/2014/07/paddle-power.html