Here is some thoughts : Some might probably be taken already we would have to check.

- Opencoin [OPC]
- Fancoin [FCN]
- Glasscoin [GCN]
- Foxcoin [FCN]
- Globalcoin [GCN]
- Warpcoin [WPN]
- Plugcoin [PGN]
- Crosscoin [CSN]
- Livecoin [LCN]
- Codecoin [CCN]
- Wirecoin [WCN]
- Cellcoin [CLN]
- Spherecoin [SRC]
- Forwardcoin [FWC]
- Vitacoin [VCN]
- Snowcoin [SWN]
- Logicoin [LGC]
- Hypocoin [HPC]
- Speedcoin [SDN]
- Railcoin [RCN]
- Punchcoin [PCN]
- Ignitecoin [IGC]
- Cupcoin [CCN]
- Ironcoin [ICN]
- Skycoin [SCN]
- Centercoin [CCN]
- Lightcoin [LCN]
- Indexcoin [ICN]
- Toolcoin [TCN]
- Chaincoin [CCN]
- Futurecoin [FTN]
- Atomcoin [ACN]
- Systemcoin [SCN]
- Powercoin [PCN]
- Iriscoin [ICN]
- Prismcoin [PMC]
- Cortexcoin [CXC]
- Honeycoin [HYC]
- Lotuscoin [LSC]
- Fusecoin [FCN]
- Sphynxcoin [SXN]
- Silicacoin [SCN]
- Ideacoin [ICN]
- Valkyrcoin [VYC]
- Stylecoin [SCN]
- Orchidcoin [OCN]
- Hivecoin [HCN]
- Startercoin [SCN]
- Rebirthcoin [RCN]
- OSXcoin [OSX]
- Ioncoin [IOC]
- Labcoin [LCN]
- Appcoin [ACN]
- Cybercoin [CCN]
- Fusioncoin [FCN]
- Hexcoin [HXC]
- Voltcoin [VCN]
- E-Coin [ECN]
- Techcoin [TCN]
- Rexcoin [RCN]
- Auracoin [ACN]