I once worked with a guy that I called Chef because I thought he looked like Chef from South Park. After a while he responded to this by calling me Gargamel, but I think that was more of a joke than me resembling Gargamel.
Also, I know it doesn't count, but since my name is Tony when I was younger many kids used to sing that song for the Frosted Flakes ads "Hey Tony, I like the things you do! Hey Tony, if I could I would be you!" and so on.
Oh, and another one that doesn't necessarily count, but my parents think that I look like DJ from Roseanne in some of my pictures from when I was a little kid.