>>> kids' parents in my neighborhood saying "He's going to go by Johnny's" meaning "go to"
>>
>>Grandma, is that you?
>
><g> Sound familiar?

That usage is pretty common around here - I've never regarded it as being in the least odd.
For instance 'I always go by the pub on the way home' :-}

I never heard anyone say that after I left the old neighborhood, but in Cleveland in the 50s it was so common that changing that pattern was a really priority in English class, since many of the kids had picked it up from parents.
>
>Come to think of it, I wonder if the expression "Come by and see me" or "I'll stop by." is a residual of that pattern. ( Maybe from German as well? Largest ethnic group in Cleveland. I have no German at all so maybe someone can comment? )
>
>
>
>
>
>
>
>
>
>
>
>
>.