Костшин-над-Одрой
His father, Karl Friedrich Necker, was a native of Küstrin in Neumark, Prussia (now Kostrzyn nad Odrą, Poland). After publishing some works, Karl Friedrich was appointed in Geneva in 1724 as a professor in public law. He started a boarding school for young Englishmen, later assisted by his son Louis Necker, a mathematician and banker.