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troperville

An opera called The Baron Kinkvervankotsdorsprakingatchdern holds the dubious honour of being the longest English manuscript title ever written.
In A Day In Hollywood / A Night in the Ukraine the Groucho Expy asks the Chico Expy what his name is,
"Oh, my name! She's-a Carlo Luigi Biondella Buonanova di Mozzarella."
"How do you spell that?"
"Wrong, every time!"
Chrononhotonthologos, a 1734 satire by Henry Carey. The opening lines go:
Aldiborontiphoscophornio!
Where left you Chrononhotonthologos?
- And that isn't even the play's full title. It's The Tragedy of Chrononhotonthologos: The most tragical tragedy that ever was tragediz'd by any company of tragedians. Any actor who can say both his name and/or his line in one breath, without tripping over his tongue deserves a medal.
There's a scene in Cyrano de Bergerac where most of Cyrano and Christian's fellow soldiers are introduced to Roxane:
"Baron de Casterac de Cahuzac.—Vidame
De Malgouyre Estressac Lesbas d'Escarabiot.
Chevalier d'Antignac-Juzet.—Baron Hillot
De Blagnac-Salechan de Castel Crabioules..."
- It's even lampshaded in the next two lines:
  Roxane: But how many names have you each?
  Baron Hillot: Scores!
Lampshaded by Joan of Arc (La Pucelle) in Shakespeare's Henry VI, Part 1, Act 4, Scene 7:
LUCY: But where's the great Alcides of the field,
Valiant Lord Talbot, Earl of Shrewsbury,
Created, for his rare success in arms,
Great Earl of Washford, Waterford and Valence;
Lord Talbot of Goodrig and Urchinfield,
Lord Strange of Blackmere, Lord Verdun of Alton,
Lord Cromwell of Wingfield, Lord Furnival of Sheffield,
The thrice-victorious Lord of Falconbridge;
Knight of the noble order of Saint George,
Worthy Saint Michael and the Golden Fleece;
Great marshal to Henry the Sixth
Of all his wars within the realm of France?
JOAN LA PUCELLE: Here is a silly stately style indeed!
The Turk, that two and fifty kingdoms hath,
Writes not so tedious a style as this.
Him that thou magnifiest with all these titles
Stinking and fly-blown lies here at our feet.
Leon Steponovitch Tolchinsky, Sophia Irena Elynya Zubritsky and Count Gregor Mikhailovitch Breznofsky Fyodor Yousekevitch from Fools.
In Rodgers & Hammerstein's musical version of Cinderella, the three members of the royal family all have absurdly long names, the Prince being introduced as "His Royal Highness, Christopher Rupert Windemere Vandermere Karl Alexander Fran�ois Reginald Lancelot Herman Gregory James, son of Her Majesty, Queen Constantina Charlotte Ermintrude Gwinyvere Maisie Marguerite Anne and His Majesty, King Maximilian Godfrey Ladislaus Leopold Sidney Frederick John."
Eddie Izzard's comedy special "Definite Article" featured a bit where he poked fun at the trend for heads of the United Nations to have exceedingly long names:
"I've changed my name, it's Jeff Jeff Jeff Smith Smith Smithly Ghali!"
"Come on in, Jeffrey-big long-named person!"
The play "The Persecution And Assassination of Jean Paul Marat As Performed By The Inmates Of The Asylum Of Charenton Under The Direction Of The Marquis De Sade" by Peter Weiss is commonly referred to as "Marat/Sade" for obvious reasons, often times even on posters.
Greek playwright Aristophanes coined the longest word ever written in literature from a comedy called Assemblywomen, Lopado�temacho�selacho�galeo�kranio�leipsaneilsmellsno�drim�hypo�trimmato�silphio�parao�melito�ypho�phatto�perister�alektryon�opte�kephallio�kigklo�peleio�lagoio�siraio�baphe�tragano�pterygon. No writer has ever created a longer word, and this record has been held since 390BC!
In Dorothy L. Sayers's The Emperor Constantine, Helena's servant derides the Emperor's name — he didn't have it that long when he had wooed (and abandoned) Helena.