I doubt that a non-Jewish name is a real “name” – when we talk about names affecting the person’s identity, we are talking about their Jewish name. One exception- the name Alexander. It is for Alexander the Great, Shimon Hatzaddik made a promise that baby boys would be called after him in appreciation for the good he did for those in Eretz Yisroel on his way to conquering the world. The name has been passed thru the generations, and you can still find some around today.
I doubt a ger, who has broken away from his past and made a new future by connecting himself to am yisroel would give his child a name reflecting his past. And even if he did for whatever reason, the child would also be given a Jewish name, which would be his real name, no matter what it says on the birth certificate.
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