Etymology
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flapjack (n.)
pre-1600, from flap (v.) + jack (n.), using the personal name in its "generic object" sense. So called from the process of baking it by flipping and catching it in the griddle when done on one side.
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pancake (n.)

"flapjack, griddle-cake, thin cake of batter fried or baked in a pan," c. 1400, panne-cake (late 13c. as a surname), from pan (n.) + cake (n.); as symbol of flatness c. 1600 (Middle English had as plat a kake, early 15c.). Colloquial Pancake Tuesday for "Shrove Tuesday" is from the old custom of eating them then.

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