The first names of Westerosi people are quite similar to the names in the real world. However this seems to be contradictory to the in-world history of the continent. The language of Andals called Common Tongue, which is rendered as the real world English is mutually intelligible throughout all Westeros. The names however sound quite alien.
Now in the real-world Europe due to religious factors Europeans adopted a lot of names of Hebrew, Greek and Latin origin. This is not however the fact in Westeros, where the Faith of Seven is a native faith of Andal. We should expect that a large portion of the names (at least these popular south of the Neck) would have English etymology.
Is there some explanation for this given by GRRM? Or any theory to explain that?