Ancient Egyptian deities: The moon god Iah
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Iahalso Aah, Yah etc.
Iah, , was an ancient, minor moon god, personification of the heavenly body  just as the Aten, the sun disk, was the embodiment of the sun. Like the more important moon deities Thoth and Khonsu, with whom he merged later on, he could manifest himself as a crescent new moon, an ibis or a falcon. 
He became part of the Osiris cult in the time of the 5th dynasty and sailed the ma'atet-boat as Osiris, for Osiris as moon child god–according to an Isis temple chant who cometh to us as a babe each month–was in the care of Thoth, of whom it was said that 2] He was especially popular at the beginning of the New Kingdom, possibly as the result of Middle Eastern influences, when names like Ahmose, meaning 'Iah is born', and Ahhotep, 'Iah is content', were frequent. In the Book of the Dead Osiris is described as shining forth in the splendor of A'ah.
Iah and his cult are but rarely referred to after the early New Kingdom. According to the Late Period Teachings of Amenemope Iah is one of the avenging deities who will establish crimes against evil-doers.
When someone acquires (something) by means of a false oath, he will be fettered by the manifested might of Iah.
 Margaret R. Bunsen, Encyclopedia of Ancient Egypt, New York 2002, p.1
 Thesaurus Linguae Aegyptiae website: Altägyptisches Wörterbuch, Berlin-Brandenburgische Akademie der Wissenschaften => Pyramidentexte => Pyramide Pepis I. => Vorkammer => Westwand => PT 481
 George Hart, The Routledge dictionary of Egyptian gods and goddesses, Routledge 2005, p.77
 M. L. Bierbrier, Historical Dictionary of Ancient Egypt, 2008, p. 98
 Thesaurus Linguae Aegyptiae website: Altägyptisches Wörterbuch, Sächsische Akademie der Wissenschaften => 3. Weisheitslehren => Neuägyptische Weisheitslehren => Die Lehre des Amenemope => 1. pBM EA 10474 => Die Lehre des Amenemope
 Donald A. MacKenzie, Egyptian Myth and Legend, BiblioBazaar, LLC, 2009, pp.27f.
 transliteration jaH
 maadit-boat: the solar bark, the Maat- (Archibald Henry Sayce, The religions of ancient Egypt and Babylonia: the Gifford lectures on the ancient Egyptian and Babylonian conception of the divine, delivered in Aberdeen, AMS Press, 1979, p.73)