Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[228] Hereupon it was that Thermuthis imposed this name Mouses upon him, from what had happened when he was put into the river; for the Egyptians call water by the name of Mo, and such as are saved out of it, by the name of Uses: so by putting these two words together, they imposed this name upon him. And he was, by the confession of all, according to God's prediction, as well for his greatness of mind as for his contempt of difficulties, the best of all the Hebrews, for Abraham was his ancestor of the seventh generation. For Moses was the son of Amram, who was the son of Caath, whose father Levi was the son of Jacob, who was the son of Isaac, who was the son of Abraham. Now Moses's understanding became superior to his age, nay, far beyond that standard; and when he was taught, he discovered greater quickness of apprehension than was usual at his age, and his actions at that time promised greater, when he should come to the age of a man. God did also give him that tallness, when he was but three years old, as was wonderful. And as for his beauty, there was nobody so unpolite as, when they saw Moses, they were not greatly surprised at the beauty of his countenance; nay, it happened frequently, that those that met him as he was carried along the road, were obliged to turn again upon seeing the child; that they left what they were about, and stood still a great while to look on him; for the beauty of the child was so remarkable and natural to him on many accounts, that it detained the spectators, and made them stay longer to look upon him.