Let's list all the names Endora calls Darrin. Here's a start:

Durwood
David
Darwin
Dexter
Dennis
Dum-Dum

Here are a few more:

Donald
Dobbin
Dumbo
Durweed
Digby
Dawson
Dalton
Dino
Daniel
Darius
Dagwood
Duncan
Dobkin
Derek
Delbert
Denton
Dar Dar
Darwick
Derwin
Dorian
Dogwood
Finally, there was the ever popular "what's his name". :lol:

For the complete list, here's a link: http://harpiesbizarre.com/nickname.htm