the.com/fellow

means A man or boy, or more generally a person — used casually, sometimes affectionately, sometimes with a hint of appraisal.

from From Old English 'feolaga,' meaning a business partner or one who lays down money in a shared venture — itself borrowed from Old Norse 'félagi,' built from 'fé' (money, livestock, property) and 'lag' (a laying together, a partnership). So a fellow was originally someone you'd pooled your cash with: a co-investor, a shareholder in risk. Over centuries the word drifted from the counting-house to the tavern to the street, loosening its grip on money and tightening its grip on company — until 'fellow' just meant the guy standing next to you, partner in nothing more than being alive at the same time.