This varies by the source material. His full name was given initially as "Squidward Johannsson Tentacles", but in the episode ''Professor Squidward'', his middle name is said to start with a Q. One source lists this as Quincy, but a reliable reference has the middle name as Quentin.
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Squidwards middle name is Quincy. Iknow this because on the epesode where Squidward gets his snail (Smelly), the guy who delivers it says "Squidward Q Tennisballs" but he says it wrong so Squidward says "Squidward Q Tentacles"
plus i did researching and found that the name was Quincy i am obsessed wityh spongebob more that anyone else in the whole world and even have spongebob wallpaper for my hallway and my room. so don't think you like it more than i do.
Little is known about Squidward's middle name except for the fact that it starts with a Q, as stated in the "Professor Squidward" episode of Spongebob.
spongebob and patrick or squillium whatever u prefer
An Easter island head.
Playing the Clarinet
The day he was born.
Spongebob would be considered Squidwards antagonist or nemesis .