Egyptian
Thoth
writing, moon, wisdom
Mesopotamian tradition. See the whole pantheon.

The moon god of Ur. In 'Enlil and Ninlil' he is the first child of the union; Ninlil then bears three more, who are sent to the underworld as substitutes so that Nanna can stay in the sky.
Deities in other traditions who share a theme with Nanna / Sin: the moon. This is overlap in one area only.
Egyptian
writing, moon, wisdom
Japanese (Shinto)
the moon, night
Aztec (Mexica)
the moon (by interpretation)
Chinese
the moon
Roman
the hunt, the moon, childbirth