I'm a regular subscriber to 5 forums. I use the usenet extensively on several groups and yet a few more private nntp groups. I'm a member of two organizations and my email box is a meeting place with a lot of people from around the world.
Now... if I see someone with the names mario, marfig, mario f. or krugar, do you really think I will bother myself letting all these people know?
Be real. If someone one day asks you if you are that person, you know what to answer. That's the direction you should take. Not the other way around.
And one more thing... no one stole your name, ok. It's not yours.