A hull named for the hunt
In present English a whaleboat is a long, narrow open boat with both ends sharp. The original work was to chase and harpoon whales from a mother ship or from the beach. The same hull later became a ship's boat, a navy workboat, and a rescue craft, sometimes fitted with a motor. The shape is the point. A double-ended hull can reverse without spinning, which mattered when a wounded whale towed the crew, and it still matters when surf has to be taken from either direction.
Typical hunting boats ran roughly twenty to thirty-one feet, with a beam a little over a fifth of the length. Under oars they were often steered with a long sweep rather than a rudder. Under sail they could take a rudder instead. Five pulling oars and a sixth person at the steering oar were a common layout. The name now covers both the historical hunting type and later copies that never saw a whale.
An English compound, not a loan
The origin of the word whaleboat is as plain as the object. Speakers joined whale and boat. The Oxford English Dictionary treats the noun as a compound formed inside English, with those two native words as its etymons. No French, Dutch, or Latin vessel-name stands behind it.
Dating is less tidy. Desk dictionaries such as Dictionary.com and Collins place the first records in the years 1665 to 1675. Merriam-Webster and the OED prefer 1682 and point to Connecticut public records. The Online Etymology Dictionary is more cautious still, noting whale-boat only by 1756. The late seventeenth century is the safest band; the exact first line in print depends on which corpus a dictionary trusts. Hyphenated whale-boat and solid whaleboat have both been used. In some naval and commercial settings the same craft is simply called a whaler.
Two Germanic halves
Neither piece of the compound is a late import.
Whale is inherited. Old English hwæl named the large sea mammal and, in some uses, the walrus as well. That form comes from Proto-Germanic *hwalaz, which also yields Old Norse hvalr, Old Saxon hwal, Old High German wal, modern German Wal, Swedish val, Danish and Norwegian hval, and Dutch walvis, literally whale-fish. Behind the Germanic noun sits a reconstructed Proto-Indo-European form, written *(s)kwal-o- or *(s)kʷálos, a word for a large fish or sheatfish. Latin squalus, a kind of large sea fish, is usually listed as a cognate, though not every Latin etymologist is equally sure of that link.
Boat is likewise native: Middle English bot from Old English bāt, from a Proto-Germanic stem *bait- (compare Old Norse báttr, Dutch boot, German Boot). French bateau and related Romance words for small craft are generally taken as Germanic loans, not the source of the English noun. The deeper root is unsettled. Some scholars connect it with a Proto-Indo-European verb meaning to split, imagining a dugout or a hull of split planks. Notes in the OED and in other specialist surveys treat the ultimate etymology as uncertain. For the English compound that deeper puzzle does not change the story. Both halves were already ordinary English words when they were put together.
The morphology stays transparent. There is no hidden prefix, no folk story about a personal name, and no shift of sound that would hide the two parts. A reader who knows whale and boat can still parse the whole.
From Basque waters to New England records
The vessel is older than the English name. An image from about 1335 already shows Basque whale hunters working from a double-ended boat of this kind. Commentators have compared later whaleboats to the Shetland sixern and to the broader Northern European clinker tradition that also produced the longship and the yole. Lapstrake planking, light construction, and sharp ends belong to that family of hulls.
By the early 1600s, written accounts of the hunt already look much like nineteenth-century New England practice: a fast, specialized boat carried in numbers on a whaleship, a crew of about six, single-banked oars, and a steering oar. Illustrations from 1711 and the 1720s show the same layout, including the loggerhead, the bollard around which the whale-line was checked. There is little detailed evidence of the exact boats of the 1600s, but a whaleship of that period carrying half a dozen or more such craft is likely to have used a purpose-built type rather than a general dinghy.
Sails come later. There is little solid evidence of canvas on whale-hunting boats before about 1825. After that, American crews often approached under sail, then unstepped the mast once the harpoon was fast and the animal began to tow. In light air they might paddle instead of row, to make less noise. By the 1850s centreboards were common, and the hulls grew a little beamier for stability under sail. The last commercial whaleships still carrying oar-and-sail hunting boats worked into the 1920s.
A name that outlived the fishery
Because the hull handled well in rough water, the word stayed after the hunt faded. Navies and merchant ships carried whaleboats as general ship's boats. The Royal Navy's twenty-seven-foot whaler is one well-known descendant. The United States Coast Guard used whaleboats as safety craft for a long stretch of its history, stocking them with hatchets, compasses, sea anchors, and other emergency gear before motor lifeboats took over. Motor whaleboats became a standard utility type on warships. Recreational Monomoy surfboats, used for rowing on San Francisco Bay and in coastal Massachusetts, descend directly from the same double-ended idea, as do some fishing designs in the Tancook line.
The same agility made the boat useful in war. New England forces used whaleboats for amphibious work from the 1690s onward, including raids in what is now Maine and Acadia. They appear at the siege of Louisbourg, in ranger companies, in the burning of the British schooner Gaspee in Narragansett Bay in 1772, and in Revolutionary crossings of Long Island Sound. A hull built to close with a whale proved equally handy for closing with a shore.
What changed is the job, not the word-formation. A hunting skiff named for its quarry became a hull type named for that skiff. If a single dating is wanted, 1682 in the Connecticut records is the citation the major historical dictionaries now prefer, even while other desk dictionaries push the window a decade earlier.