A trapezium or parallelogram. A pentagon can have a pair of
parallel sides. Polygons with 6 or more sides can have two (or
more) pairs of parallel sides.

If the shape (a quadrilateral) has only 2 parallel sides, it is a trapezoid (UK trapezium). A shape with four sides and two sets of parallel sides is a parallelogram (rectangle, square, rhomboid, rhombus) because these figures have four sides and two sets of parallel sides.

There is no generic name. Any polygon with 4 or more sides can have 2 parallel sides. There are also non-polygonal shapes that can have parallel sides: for example, a circle that is stretched out into a cigar shape can have two parallel sides.