I thought that was strange, but he was named after an old family friend. I called him
John forever, and his family finally assimilated me into calling him
Johnny :o)
It's ok. I use it all the time. But I wouldn't do it to my kid, simply because, imo,
Johnny is a NN.
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John: Why do you know all this random, useless stuff?
Me: One day I will win a lot of money on Jeopardy.