"Sebastion who?"

Here something thats niggleing me, but what do the first two initials on Sebastions name actually stand for?! It's always been just 'J.F.' <BR>Is there any indication on any novels/ early scripts/ whatever as to what they might actually <!-- BBCode Start --><I>stand for?</I><!-- BBCode End -->
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Jack Frost?
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In the book, the related character is "J.R. Isidore" so that wouldn't help much! In fact in the 1980 script, it actually has both "J.R." and "J.F." I don't recall if they ever bothered deciding what the initials stand for.
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John Fitzgerald ...?
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Jeff Foxworthy?
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Hahahaha, well I hope not because that would change my whole perception of the character...