At the very end of the previous aliyah, G-d commands that the Jewish people be counted again. Therefore this, the second aliyah, names all the families and their counts. Rashi points out that each family name is expressed as the father's name, with the Hebrew letter 'hay' at the beginning, and a 'yud' at the end. Rashi says that these two letters are representative of G-d's name and are G-d's testimony that the Jews descended from their Jewish fathers and that the Egyptians had no immoral relationships with their mothers.