From Latin focus (hearth) because the bread was originally baked on hearthstones — sibling of the English word focus
A flat Italian bread made with olive oil and typically seasoned with herbs and salt
From Italian 'focaccia', from Late Latin 'focacia' (hearth bread), from Latin 'focus' meaning hearth or fireplace. The bread was originally baked on the hearth stones, not in an oven. The same Latin root 'focus' gave English the word focus (originally meaning fireplace, later the central point of attention) and the French words feu (fire) and foyer (hearth, entrance hall). Focaccia-like flatbreads have
The English word focus literally meant fireplace in Latin. Johannes Kepler adopted it in 1604 as a mathematical term because he imagined rays of light converging at a single point the way heat concentrates at a hearth. Focaccia and focus are therefore siblings — both children of the Latin fireplace.