I think it's pretty. I don't love it enough to use it, but I don't mind it at all. I think Sono would be an adorable nickname, but there would be quite a few options:
Sony
SunnySonaSono
SoraNoraNori
Three boys nappin', one mama namenerdin'
To peruse my top 100ish names:
http://www.behindthename.com/pnl/82589
He is becoming greater, I am becoming less
Bits of the journey here:
http://jodifriesen.blogspot.ca/And some family cuteness here:
https://www.flickr.com/photos/41705228@N08/