well, first of all I already have someone named Mark in my family. What's worse he works in the same industry. Second, someone who changes my name to something totally different just to make it easier for them, screams "I don't give a flying f* who you are, and I can't be bothered to learn your name". I use to allow people calling me many names - Mario, Mark, Marcus,Martin etc. That stopped when I realized that I'm not helping anyone by doing this, but it actually is weird when you're in a meeting and everyone calls you a different name.