Another ridiculous claim made by Daniel Cassidy in his nonsensical book, How The Irish Invented Slang, is the idea that the name of the game of craps, an American dice game, comes from Irish. All of the dictionaries trace the origins of craps to Louisiana. The game derives from crapaud, the French for toad, because people squatted like a toad over the ground as they played it. Cassidy doesn’t bother mentioning this alternative, well-established and highly probable explanation.
Cassidy’s made-up explanation is that it comes from crath abair, which Cassidy says means ‘shake-say’. Of course, this would really be craith or croith, not crath, and it wouldn’t sound much like craps (krah-abbur is the way most people would pronounce it). If craps were of Irish origin, it would be far more likely to have some connection with cnaipí (pronounced krippee in Ulster Irish, which means buttons).
Cassidy’s suggestion Is wildly improbable, like almost every suggestion in this ridiculous book. There is absolutely no evidence for it and the French explanation makes a lot more sense.