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Of uncertain origin. The word has many disparate senses, which are likely of diverse origin. The specifics of these origins have long been debated, as has the question of which senses arise from which origins. At least the swan sense originated in Middle English cobbe (“male swan; gang leader; bully”). Some other senses likely originated as a variant of cop (“head, top, peak, summit”). In other senses, the word may be related to cub, itself of obscure origin but possibly from Old Norse kobbi (“seal”). However, many alternative etymologies have been proposed to account for some or all senses of cob; various sources have related it, for example, to English cot (“cottage”), Welsh cob (“top, tuft”), or German Kübel (“large container”). All these etymologies are disputed, and the exact origins of cob cannot be known with any certainty.

Uncertain. Possibly onomatopoeic, but it has also been suggested that the word could be a continuation of Middle English cobbe (“fight”), a borrowing of Welsh cob (“blow”), or a cognate of Icelandic kubba (“chop”).

Uncertain likely from resemblance to the action of eating corn off a cob.