Why "yam" shell? What do yams have to do with computing?

The origins of the yam are shrouded in mystery...

Maybe it's the things yams (the vegetable) and yamsh have in common:

• Straightforward to use.
• First priority is to get the job done. No fancy stuff.
• Versatility.

YAMsh might also be an acronym:

• Yet Another Modern Shell
• Yes! A Modern Shell!
• yamsh: a modern shell