I'll try to answer the question:
Names are said to have power & great significance in cultural history. In the Bible, God's name is not known because ancient Mesopotamian cultures believed knowing the deity's name gave them power in spells and prayers. Hence, do not take the Lord God's name in vain means do not use it for an incantation or means to assert power over others. Its probably also why the name is given "I am that I am" in Exodus or Yahweh (YHWH) in Hebrew. Note: I'm not trying to covert anyone on any belief, but telling information learned from my college history & anthropology classes.
If you are looking for more information, I'd recommend researching articles or books concerning religion and mythology. For example, the History of God by Armstrong or Encyclopedia of World Religions by Merriam-Webster. Hope this answers the question.