Yours, Etc.: Origins and Uses of 8 Sign-Offs
agent noun from heckle (v.); mid-15c., from late 13c., as a surname (Will. le Hekelere). Modern sense of "one from the audience who taunts a public speaker" is from 1885. Fem. form hekelstere is attested from c.1500.
early 14c., "to comb (flax or hemp) with a heckle;" from heckle (n.) or from related Middle Dutch hekelen. Figurative meaning "to question severely in a bid to uncover weakness" is from late 18c. "Long applied in Scotland to the public questioning of parliamentary candidates" [OED]. Related: Heckled; heckling.
"flax comb," c.1300, hechel, perhaps from an unrecorded Old English *hecel or a cognate Germanic word (cf. Middle High German hechel, Middle Dutch hekel), from Proto-Germanic *hakila-, from PIE *keg- "hook, tooth" (see hook).