by reptilian do you mean a deity associated with reptiles, a specific reptile, or half reptile half human?
well there's many associated with the snake. Egypt for example has, like, ten, be they gods or demi-gods. Ra and Set for example, but there's also Nehebkau [who binds the Ba and Ka and guards the Duat] and Wadjet [protector of lower Egypt. she's seen as a snake with a human head sometimes] you also have the biblical Lilith and Lucifer.