I always say no attention should be paid to the credits, especially when it comes to the names of characters. What matters more is that character's name as printed out or spoken within the context of the onscreen story.
And it looks like it happens to the actors who play those characters as well.....
Every so often Potts would have the lead in an episode rather than Gene Barry, Robert Stack, or Tony Franciosa. One of those occasions was the episode "Pineapple Rose". But unfortunately his moment in the sun was ruined by that opening title credit.
From the IMDb:
Cliff Potts was born on January 5, 1942 in Glendale, California, USA as Clifton Vandyke Potts.
I haven't found any mention anywhere that he went by the name of "Cliff Potter".
Over forty years after and I wonder if it sticks in his craw? I would have thought Universal would have done what it could to change it as quickly as possible. But then, I'm not tight with a dollar like studio heads are......