I really haven't heard 'corona' before outside a scientific context and even then, as layman, only related to an eclipse. The word 'Hof' is very common in German and has different meanings. There's Warzenhof, the human areola, which is described as 'ring, circle around/surrounding something of different colour', according to the Duden, and also what you described: an area or amount of space, defined by a wall or fence. Also, 'Hof' is or is part of different kinds of farmsteads and the royal court, where 'höflich' is derived from. I'm not sure if your rule is applicable to all these meanings, but you see, the direction isn't wrong either.