TOD:
I have a well-ingrained habit of whittling everyone's name to the first syllable once I get to know them well enough. Shelley becomes Shell, Jacob become Jake, etc..
Then about two years ago, a guy named Shittah started to work in my office.
While I never made the actual faux pas, a few times I came close and it wound up sounding even worse when I stressed the final syllable. Fortunately for me, the guy had a sense of humor about his name. But even so...