Hm. Ok, please take this in the spirit of support it's meant!
I think you're overreacting. It's just a name. It's not you. It has nothing to do with you and it's no reflection on you. Even the fact that it's a cow means nothing.
Seriously. I just watched a movie where the main character (who is a cop killing prostitute) bears my name. Should I write a nasty email to the producers of the movie because of that?
My cousin is named Elsie. In the US, Elsie the Cow is the symbol for Borden Dairy (
http://en.wikipedia.org/wiki/Elsie_the_Cow). Should she be all upset because of this?
I do understand ... I really DO ... that people are teasing you. But that's about THEM ... not about the company. And NOT about you. So the next time someone teases you about it ... look them straight in the eye and say very seriously "So are you calling me a cow?" and watch them back down.
.