Spiro Papadapaconstantikasgianopolopodopotopolis

Spiro Papadapaconstantikasgianopolopodopotopolis is the Greek owner of Spiro's.

Behind the Laughter
There's a gag on how he has absurdly long name, yet Homer and Marge both pronounce it without ever stumbling. It gets even funnier when Homer can't remember "Rita LaFleur".