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Nymph- a larval stage of an insect, most commonly used in connection with Silk worms.
Silk- an expensive type of fabric, typically used for making dresses or elaborate ribbons, derived from the cocoons of silk nymphs. Consider the name Syl-v-eon sounds like silky-on doesn't it? Also look at those dirty great silk bows on it that move in the wind like silk.
Fehler- means bug (of the computer error kind) in German. Game Freak love giving pokemon pun names like this more than life itself, especially when it comes to eeveelutions.
Anyone who thinks Sylveon is anything but SILK type needs their head examined.