I'm responding to REALLY old forum messages. :-) I've searched and search SO many ship registries dating before 1700 and all I could find was Casson.
I don't think the Cashon name is Irish even though I initially thought that. I have James Cashon born before 1700 and my search ends there! It's driving me nuts. If anyone has gone beyond that, I'd love to know.I start with James(my dad) and end with James. Weird. :)