How is it translated? の意味は？

They are written as アンドレイナ and ガブリエル respectively, but ガブリエル is not a phonetic representation of the English pronunciation of Gabriel. It might have come from Portuguese many, many years ago because the name has a biblical origin. If you would like Japanese people to pronounce Gabriel in the English way, you might want to use ゲイブリアル。