Qian is a good idea. but changing Cash into Qian might not be one. Why not just launch a new Qian Coin? you can use the same algo as Cash if you like.
That makes absolutely no sense unless you're talking about doing a coin swap which is messy and generally a bad idea. Changing the name and doing a relaunch is a good idea and it has been done plenty of times as long as it's a better name which the community agrees on.
The only reason I ever invested into CASH was its name. CASH is on Cryptsy, Cryptsy is in USA, Florida. Most of investors in CASH comes from USA. On next bubble CASH will be first coin to invest from noob investors, because of name. OMG, do not touch that name, do not even think about that. I have lot of money there and I am 100% sure I will sell them 100x more expensive with this name on next buble. If someone wants chinese name, than let him create chinese clone and trade it on chinese exchanges. Don't be stupid, CASH has top coin name.