(1):

(n.) One who whiffles, or frequently changes his opinion or course; one who uses shifts and evasions in argument; hence, a trifler.

(2):

(n.) The golden-eye.

(3):

(n.) One who plays on a whiffle; a fifer or piper.

(4):

(n.) An officer who went before procession to clear the way by blowing a horn, or otherwise; hence, any person who marched at the head of a procession; a harbinger.