Welcome, vienna/JiaYing - it's good to have you on the Board with us, where you join a select band of people whose first language is not English and who provide the rest of us with a refreshing and useful insight into the language from the outside (if you see what I mean!)

As to an English name beginning with J, there are several "popular" ones - the popularity depends, to some extent, on whether you are going to England, America, or Australia/New Zealand.

In the UK, Janeis always popular: nice, short, easy to say. But Juliette/Julia/Julie are all quite usual names.
Joan and Judith/Judy aren't quite so common these days, but are still usual enough not to stand out too much.

But one name which is very popular over here, at the moment, is Jade, which you might consider. It is seen as a beautiful gem, with the idea of pleasure attached to it, and it has decidely Chinese overtones.