How would you write this name in kana?

In a couple of sites I've been asked to write my name in kana (for package deliveries). I know how to write my own name, but my girlfriend's last name (Petzold) confuses me a little. It's a german name, so it's pronounced something like "pets all'd" (at least in Argentina; perhaps in germany it has another pronounciation).
I'd go with ペッ卜ゾル, but I don't think it's quite right. I can only read katakana; I don't know any romanization rules. Any suggestions?

I'm unsure but here is a sample.

チャールズ・ペゾルド
チャールズ・ペゾルト Charles Petzold
http://ja.wikipedia.org/wiki/%E3%83%81%E3%83%A3%E3%83%BC%E3%83%AB%E3%8...

You can always try Google Translate. It gave the correct katakana for my name.

translate.google.com

Thank you, @japaneseboy, I think that's the way to go.

@Susan, Google Translate somethimes sucks when your name is not in their list, so I don't usually rely on it for things like this.

ペツォールト
According the Japanese wiki page of Christian Petzold!

That assumes it's pronounced with a T sound at the end (like German).

If you want a D sound, just change to...
ペツォールド

http://ja.wikipedia.org/wiki/%E3%82%AF%E3%83%AA%E3%82%B9%E3%83%86%E3%8...

In the Japanese Wikipedia article of Charles Petzold mentioned above, you have this indication:

「Petzold」は、"pet's old"のように発音する。
"Petzold" is pronounced like "pet's old".

So, if this is right, the name is normally written in katakana "ペツォールド, as junkymotown explains.

For me should be ペトソルド Of course doesn't sound as germany name, but japanese sacrified this sound in order to be clear for them. You can see that in all english word written in katana: never sound as the original.

Thank you! I think I'll go for ペツォールド. I think it has a better resemblance to the sound we use.