I personally wouldn't change it if I could , name is not perfect but It's not bad either . But like some people pointed already , there is no "coin" in Bitcoin .
But I suppose if bitcoin will screw fiat over , Physical coins should be created in the future .
The name coin is given to it because it has a logo/monogram/virtual design like a coin.
And I like the name coin with it, and it is the word coin which convinced the newbies and other people to understand it as a normal currency.