Hm.
The
Cori or
Cora nickname does soften it up, as you say.
The -iander makes me think of
Leander, so it doesn't feel very feminine to me.
Also, I keep seeing colander when I look at it, so it doesn't feel very name-y to me either.
But the sound is not bad, really. I certainly don't love it and it feels a bit fantasy-ish, but I think it could work okay.
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