The name CLAM was my brain child I suppose and took some convincing     Other options were scrip or buckazoids (I was REALLY pushing that one) and some other I foret. 

Clam's (the real life object) have been used as a currency in the past.. Im also a fan of the flintstones. It was also something that was said around where I live.  "You owe me 5 clams!"  was used as a way to say you owe me 5 bucks / dollars etc.  Another slang for money.