In the episode, "Plankton's Army" Plankton announced his full name once he got to the secret formula. He said, "I, Sheldon Jay Plankton," So his middle name must be "Jay".
However, if you look at the transcript for the epison, Plankton says, "Sheldon J. Plankton." Therefore, his middle name is not mention, but his middle initial is "J."
He does not have a middle name.
Keith's middle name is Ronald.
he has no middle name
Her Middle name is Dakota. Her First name is Hannah. Hannah Dakota Fanning.But She is called by her Middle name Not First Name
Harry Style's middle name is Edward.