There is not a name becasue there are many different shapes.
A sphere, an ellipsoid, a torus (doughnut), toroidal shapes with two or more "holes", a paraboloid, semi-hyperboloid etc are all 3-dimensional shapes which have got just one curved surface.
One option would be hemidisc.
Cylindrical shape or Cylinder shape
Cone.
A cone.
a cone
A sphere.
sphere
A Cone
The answer is - a cone.
If you have one flat face and I have one curved face, which one of us is the 3d shape? Anyway, a 3d shape with pne f;at, circular face and one curved face could be: a section of a sphere or a section of an ellipsoid cut by a plane parallel to one of its axes, a section of a paraboloid or a cone. There are probably other shapes.
A cylinder !
A cone.