Guest, your turn is ingenious but unrealistic. Dinah was a well-established female given name by the time Stephen Foster was born -- you will recall, for example that it was the name of Alice in Wonderland's cat -- and it is unusual for phonemes to slide from lower to higher energy requirements (it is physically easier to say dinner than Dinah).

The overtones of "someone in the kitchen with Dinah strumming on the old banjo" are off-color, in case this was not obvious. I leave it to you to interpret what strumming on the old banjo might consist of.

A