Etymologists take a gingerly approach to assigning any particular origins to this word. While it might have come from the name of the spice, there's nothing concrete to back up that idea. Another conjecture is that it's related to an Old French word, gensor, which meant "delicate." That's because in 16th century English an earlier sense of gingerly often referred to dancing or walking with dainty steps. Not till the 17th century did it change to apply to movements that were cautious in order to avoid being noisy or causing injury, and to a wary manner in handling or presenting ideas. Not too surprisingly, given its -ly ending, gingerly is also quite often correctly used as an adverb, as in "they moved gingerly on the icy pond."