Why was the grill named 'Spitfire'???

The producer was approached by a religious group who wanted to fund a film with a spiritual message. He named the film for basically the first thing he saw: a bar called "The Spitfire Grill."

From wikipedia:

The idea to create this film was the brainchild of Roger M. Courts, long-time Director and CEO of Sacred Heart League, Inc., a Catholic nonprofit fund raising and communications organization based in Walls, Mississippi. Mr. Courts spent 42 years with the organization and was a pioneer in direct mail fund raising in the United States. In the late 1970s, he conceived the idea to "print" a story on film --- an alternative to the very active ministry of print that was a hallmark of Sacred Heart League, which published and distributed millions of pieces of religious, inspirational, and devotional literature.

With the approval and support of the League's Board of Directors, Mr. Courts embarked on a search for a screenplay that could be produced under the direction of Sacred Heart League's for profit film production subsidiary, Gregory Productions, Inc. Mr. Courts and his colleagues read more than 200 prospective screenplays and found most of them lacking in Judeo-Christian values and good story-telling. In the early 1990s, Mr. Courts was introduced to Warren Stitt, who eventually became the Executive Producer of "The Spitfire Grill." Mr. Stitt knew of the work of Lee David Zlotoff, and an introduction was made. Mr. Courts agreed to field screenplay treatments from Mr. Zlotoff, and in late 1994 the story of the film was born created by Mr. Zlotoff.