https://eprint.iacr.org/2012/596.pdf

Ironically "Shadow" addresses is a technical term used to describe the only privacy mechanism adopted by Bitcoin.

"Bitcoin, in order to improve anonymity, produces a shadow address which collects back the change that results from any transaction. So when a single transaction has 2 outputs, you have to predict which one of the output addresses is actually belonging to the same user that initiated the transaction. If one of those two outputs has never appeared before in the blockchain, while the other has, then we can assume that the one that never appeared before is the shadow address." - http://bitcoin.stackexchange.com/questions/14322/how-many-public-keys-is-there

I think ShadowCash is a fitting name to pick up where Bitcoin left off in regards to privacy.