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While names have connotations, those are, most of the time, different connotations for different people. Hearing the name 'Brad' one person can think of Brad Pitt, another of Brad who bullied them ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/37473 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/37473 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
While names have connotations, those are, most of the time, different connotations for different people. Hearing the name 'Brad' one person can think of Brad Pitt, another of Brad who bullied them at school, and yet another - of their best friend Brad. You cannot account for every association a reader of yours might have from any name. However, just like in Real Life I might meet a person named Brad and get to know him as quite separate from Brad Pitt, so your readers would get to know your character as quite separate from whatever image their previous connotations might have drawn.