What is "Plankton's" first name in Spongebob Squarepants?

Question

What is "Plankton's" first name in Spongebob Squarepants?

Answer 1

Sheldon J. Plankton (never mentioned middle name)

Answer 2

Sheldon J Plankton (but I think it has only been mentioned once)

Answer 3

Sheldon

the J was never identified.

Answer 4

Sheldon  

Answer 5

.....SHELDON.......he hates his name very much that he wants to be called by his last name......his computer wife laughed at his first name when she found out......

Answer 6

Sheldon ;-;

Answer 7

In the episode where Plankton"s cousins come to visit they say that his 1st name is Sheldon.

Answer 8

What they said. Sheldon. So... what does the J stand for? XD