In the American comic strip "Garfield", what is Gardfield's owner's nickname?

"Garfield", created by Jim Davis and circulated by Universal Press Syndicate, is the world's most syndicated comic strip appearing in 2,570 journals worldwide. "Garfield", the coffee and lasagna-loving cynical fat cat, celebrated its 25th year in syndication in 2003, having debuted on June 19, 1978, in 41 U.S. newspapers and read by some 263 million newspaper readers around the globe.

Jon (which is used as a nickname for Jonathan Q. Arbuckle) is Garfield's owner. He is, usually, depicted as a clumsy and awkward geek who has trouble finding a date. Jon had a crush on Garfield's veterinarian (Liz) and is now dating her.

Jon disapproves of Garfield's blasé attitude and often encourages his pet to take an interest in the world around him, sometimes stating an interesting fact, or asking a philosophical question in an attempt to prompt "Garfield" into thought. "Garfield" tends to brush this off with a simple, yet logical remark, and despite the trouble, "Garfield" causes, Jon has a heart of gold and is very tolerant of Garfield's shortcomings.

In the December 23, 1980, strip, Jon states that he is thirty years old. His birthday is July 28. His personal will states that he wishes to be cremated and have his ashes spread over his accordion. He can play accordion, bagpipes, guitar, banjo, and bongos and sing, though his singing and musical skills are not the greatest. His favorite color is red, he likes decaffeinated coffee, chocolate chip cookies, and unleaded gasoline.