Pen name?

Hi!
Sorry, I'm already opening a new thread in this section... I've been thinking about changing my pen name for about two months, and I got various (and contradictory) advice about whether I should do it or not.
So, my actual pen name is Vanessa du Frat, often nicknamed Ness du Frat. I've got about 300 000 google hits with them combined (ok, most of them are because of facebook or blog posts, but anyway ^^).
When I decided to translate my book to English, I thought I might as well get an English-souding pen name. The French name is Vanessa A. du Frat, I thought I could use Vanessa D. Anderson as a pen name for my English books.
Why?
First because I thought people might be confused by the name "du Frat", which is all but common (that's also the case in France, nobody knows how to write it or pronounce it), and that they might mispell it if they heard it once and wanted to look it up on the internet (one can dream ^^). Not even mentionning people who would type it quickly and write Vanessa du Fart, which wouldn't be that great...
Second, I thought about my French readers, who would be lost if they suddenly saw a book in English under the same pen name (of course, they could think a big shot publisher liked the book so much he decided to translate it, but probably not going to happen).
Third, because people told me American readers (I don't know if that's the case with other English-speaking people) don't want to read translations. I mean, I can see that with movies already, every time France makes a great movie (or should I say, the few times when France makes a great movie ^^), instead of being dubbed, it's re-made with American actors and stuff. While I totally understand it for Japanese movies, for example, because the culture is so different (personally, I'm a big fan of horror movies, and I really don't like the Japanese horror movies, I might be dumb, but I don't grasp half the things, so I prefer to watch the remakes), I don't really understand it for European movies.
Anyway, I was told that nobody would buy my book if I have a French name. A friend of mine who wrote several short stories and had them translated to English never sold a single one in the US. (and it was obviously not because of his name, because he chose an English-sounding pen name, but he had to feature the translator's name in the book, as it should be done, and he thinks that's the main reason why it didn't have any success)

So, what should I do? Keep my French pen name or choose Vanessa D. Anderson as my pen name for English books?
Thanks, and sorry for the long post... I'm a very talkative person, I write lenghty novels, and I'm really, really bad at summing things up

Thanks! That's very useful. The funny thing (which has nothing to do with the matter at hand, though) is that my real name is English (actually, English first name, French surname) and sounded so much like a pen name that I changed it. (it was not the only reason, but still) People who find out my real name (everybody knows me under my pen name, except, of course, family and childhood friends) all have the same reaction: "Oh, I love it, it would make such a great pen name, it sounds totally like something a writer or an actor would pick."
Yeah, except I hate it ^^

An German friend living in the UK told me she thought Vanessa du Frat was fine. She then asked her boyfriend (English) what he thought about it, if he had difficulty pronouncing it, and he said it was fine.
But still...
Maybe I should pick up another name, a more original one, that doesn't sound too "French"?
Arrrghh, it's such a tough decision...

Thanks!
So you think the issues I mentionned are not really important? (I can't really judge how much of a problem it would be for non-French speaking people to remember and write my name. You wouldn't be bothered with having to remember a weird author name?)

Ok, thanks!
It's much clearer for me now.
Old Hack, as I said, people have been telling me these things. The reason I'm asking is because I want to know whether it's true or not, because I know how stereotypes can be wrong.
As for dubbed films... When the dubbing is well-done, you don't even notice it. It's not like in Russia, where they don't have the money (or didn't, I don't know how it is now) to do proper dubbing and where a guy (same guy for all characters) speaks over the characters' voices (and you can still distinctly hear the original voices).
Anyway... I didn't mean to offend anybody with my questions, especially since I was asking about something a few people told me, and not about what I myself think. Sorry if I made you uncomfortable.

Ok, still a bit off topic, but since we're talking about it... My bestfriend told me once he had downloaded a movie on the internet (long time ago, 15 years, at least) and when he opened it, he discovered it was an "adult" movie. "Dubbed" in Russian... The guy doing all the characters was also "dubbing" the screams and moans of the girls in a totally bored tone, all of that over the original voices. I was sure he was joking, but I told somebody once, and this person assured me it was very real and he'd had a similar experience once ^^

Anyway, back to the original topic... Thanks to your advice, I'm going to keep my original pen name.

I'm not asking to change my username in the forum yet (although I saw it was possible), since I'm trying to keep this project as "secret" as possible, because people around me aren't really supportive. When I told a few friends I wanted to translate the book, most of them were supportive, but one of them simply said: "Why are you doing that? It's so stupid and it's a waste of time." So I prefer to finish everything before saying something about the translation, in case people want to "help" by giving their opinion and poking their nose in my project.

So thank you everybody for helping me see things more clearly

Ok, thanks! Of course, I'm sorry the things I said hurt you and made you uncomfortable, that was not my intention at all. But like I also said, what I wrote was a question about what people told me, and not what I myself think (how could I think anything since I had no idea if it was indeed the case or if it was just hearsay?). Therefore, I can't be sorry I asked (since now I know the people I asked just gave me very bad advice, and I can stop wondering whether it's true or not). But I am, of course, sorry I hurt you by asking, especially if I passed as a racist, what I'm absolutely not.