The Collaborative International Dictionary of English v.0.48:
Hardock \Har"dock\ (h[aum]r"d[o^]k), n. [Obs.] See Hordock. [1913 Webster]The Collaborative International Dictionary of English v.0.48:
Harlock \Har"lock\ (h[aum]r"l[o^]k), n. Probably a corruption either of charlock or hardock. --Drayton. [1913 Webster]