Dinah is not the name of the owner of Dinah's restaurant, but rather was taken from the song "I've Been Working On The Railroad". The lyrics are "Can't you hear the captain shouting,
"Dinah, blow your horn!"
Dinah, won't you blow,
Dinah, won't you blow,
Dinah, won't you blow your horn?
Dinah, won't you blow,
Dinah, won't you blow,
Dinah, won't you blow your horn?"