The Hebrew word "lilit" only shows up in Isaiah 34:14, where most modern translations render it as something along the lines of "night bird." However, some scholars believe the word would be better translated as demoness and see it is a reference to a Mesopotamian spiritual being. Later Jewish tradition described a demonic figure known as Lilith in a variety of ways. For more details, check out my post focused specifically on Lilith, Demons, and Evil Spirits.