It's not one I love, but I can certainly appreciate it. It is indeed strong and feminine at the same time.
Marcy is kind of a cute nickname too. I think I'd prefer it to
Ella, as
Ella is so so common as a full name and a nickname.
Three boys nappin', one mama namenerdin'
To peruse my top 100ish names:
http://www.behindthename.com/pnl/82589To peruse my non-name musings:
http://jodifriesen.blogspot.ca/