Cobbler is a word with uncertain origins and multiple meanings that may or may not be related. The shoemaker sense — a person who repairs (rather than makes) shoes — appears in Middle English as cobelere, from the 13th century. Its etymology is genuinely unknown, though various proposals have been offered: a connection to "cob" (a rounded lump or head), to "cobble" (to mend roughly), or to an unattested word related to the tools or materials of shoe repair. None has achieved consensus.
The distinction between a cobbler and a cordwainer was important in medieval guild culture. A cordwainer (from Old French cordouanier, "worker in Cordovan leather") made new shoes from fresh leather. A cobbler repaired old ones. The two trades were organized into separate guilds, and territorial disputes between them were common. The Worshipful Company of Cordwainers and the Worshipful Company of Cobblers existed as distinct London livery companies. The cobbler's lower status — working with old leather rather than new — is preserved in the phrase "a cobbler's children go barefoot" (a professional who neglects
The American dessert called cobbler — a baked dish of fruit covered with a rough, biscuit-like topping — appeared in the mid-19th century. Its name may reflect the rough, cobbled-together appearance of the topping (lumpy, uneven, placed rather than shaped) or an analogy to cobblestones. Unlike a pie (with a pastry crust) or a crisp (with a crumble topping), a cobbler has a thick, doughy upper layer that bakes into a golden, biscuit-like surface while the fruit bubbles beneath.
The proverbial advice "cobbler, stick to your last" (the last being the foot-shaped form used in shoemaking) derives from the Latin ne supra crepidam (sutor iudicaret) — "let not (the shoemaker judge) above the sandal." Pliny the Elder attributes this to the Greek painter Apelles, who accepted a cobbler's criticism of how he depicted sandals but drew the line when the same man began critiquing anatomy. The proverb has been standard advice about staying within one's expertise for over two thousand years.