I prefer
Dennis to
Denis, which I automatically pronounce the French way--in my head, at least. The chances of me running into a de-NEE are so unlikely that I'd say it out loud just like
Dennis.
Anyway, I love
Dennis nn
Denny. It's fun and a bit retro (very 50s-60s, after all), and I wouldn't think of
Dennis the Menace if I met one (mostly because I hate that comic and they thankfully stopped running it years ago in the papers I read).
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