This is the 3227th most frequent Japanese word.
大野
Ōno (大野): A Japanese surname or place name meaning "large field" or "big plain."
In this sentence, '大野' is used as a Japanese surname addressing a specific person in a polite manner.
大野さんは、いつも優しい笑顔を見せてくれます。
Mr. Ohno always shows a gentle smile.
Here, '大野' refers to a geographic feature, specifically an open plain or field.
この近くには広い大野があります。
There is a wide plain nearby here.
In this case, '大野' is metaphorically used to describe dense fog as a natural phenomenon.