Oval which has an elliptical shape when viewed from the top. If it is much greater then that, when looking from the top, you will see a dark areas in form of a wedge hugging the minor axis from each side. This is called a bow-tie, and is undesirable. It just is not pleasing to the eye. Emerald cut, which looks like a box from the top, with truncated corners.
Pear shape is also a popular cut.
It looks like a tear drop. Trilliant, variation of this spelling, or any other cut starting with 'tri-' are usually trademarked cuts. As the name suggest, they are all in fact triangular in shape, usually with truncated corners, with a variety of facets. Quadrilliants, Squarilliants, and such, are unsurprisingly, square when viewed from the top. Other cuts you might encounter maybe named after a variation of the ones listed above.