There are sites that do translation:
Look at this:
http://www.nciku.com/search/zh/beth
or this:
http://www.chinesenames.org/find-name-Beth.html
Note that name translation tend to be phonic, i.e. use of characters to approximate the sound and as you can see from the above, often have different results. Perhaps some other forumers can help to say which is better (more meaningful) or sounds better.
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