'Round' replaced Old English 'sinwealt' after the Normans — from Latin 'rota' (wheel). Kin to 'rotate.'
Shaped like a circle or sphere; having a curved surface with no sharp edges or corners.
From Old French 'roond, rond,' from Latin 'rotundus' (round, circular, spherical), from 'rota' (wheel), from PIE *Hret- ('to run, to roll, to rotate'). The PIE root is the source of one of the largest etymological families in English: 'rotate,' 'rotary,' 'roll,' 'roulette,' 'control' (from Medieval Latin 'contrarotulus'—a counter-roll), and 'rodeo' (via Spanish). Latin 'rota' was itself borrowed into Old Irish as 'roth' (wheel) and
English originally had its own Germanic word for 'round' — Old English 'sinwealt,' meaning 'round' or 'cylindrical,' composed of 'sin-' (perpetual) and 'wealt' (rolling). But 'sinwealt' was entirely displaced by the French-Latin borrowing after the Norman Conquest, one of the clearest examples of a basic shape word being replaced by a foreign import.