Use the leet alphabet and go with KO1NY3.
Clever idea ^^
Voted KOIN in the poll, it's catching on. Who cares what it sounds like? I mean we are voting for abbreviations for possible exchanges, not the client. No one complains about not being able to pronounce, "btc"
If you really want a client name change... It is true coinyes rolls off the tongue, but it is terrible to make plural. Coinyes' ?! Coinyeszis?
12 other possibilities: COY, CYE, COI, CIN, CNE, COINE, and all of those with a K instead (for example KOY)