“The cult of the moon-god was one of the most popular in Babylonia, the chief seat of his worship being at Uru (now Muqayyar) the Biblical Ur of the Chaldees. The origin of the name Sin is unknown, but it is thought that it may be a corruption of Zu-ena, “knowledge-lord,” as the compound ideograph expressing his name may be read and translated.
Besides this compound ideograph, the name of the god Sin was also expressed by the character for “30,” provided with the prefix of divinity, an ideograph which is due to the thirty days of the month, and is thought to be of late date.
With regard to Nannar, Jastrow explains it as being for Narnar, and renders it “light-producer.” In a long hymn to this god he is described in many lines as “the lord, prince of the gods, who in heaven alone is supreme,” and as “father Nannar.”
Among his other descriptive titles are “great Anu” (Sumerian /ana gale/, Semitic Babylonian /Anu rabû/)–another instance of the identification of two deities. He was also “lord of Ur,” “lord of the temple Gišnu-gala,” “lord of the shining crown,” etc.
He is also said to be “the mighty steer whose horns are strong, whose limbs are perfect, who is bearded with a beard of lapis-stone, [*] who is filled with beauty and fullness (of splendour).”
[*] Probably of the colour of lapis only, not made of the stone itself.
Besides Babylonia and Assyria, he was also worshipped in other parts of the Semitic east, especially at Harran, to which city Abraham migrated, scholars say, in consequence of the patron-deity being the same as at Ur of the Chaldees, where he had passed the earlier years of his life. The Mountain of Sinai and the Desert of Sin, both bear his name.
According to king Dungi (about 2700 B.C.), the spouse of Sin or Nannara was Nin-Uruwa, “the lady of Ur.” Sargon of Assyria (722-705 B.C.) calls her Nin-gala.
Theophilus G. Pinches, The Religion of Babylonia and Assyria, London, 1906, pp. 81-3.