It is a trapezoid that has 4 sides 2 of which are parallel to each other but of different lengths.
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A square has four parallel sides (two pairs of parallel sides).
An octagon can have 0, 2, 3, 4, 5, 6, 7 or 8 parallel sides. A regular octagon has 4 pairs of 2 parallel sides, (8 parallel sides in all).
That's a trapezoid.
It is possible for a hexagon to have one pair of parallel sides. A hexagon can have 0, 1, 2 or 3 pairs of parallel sides, and can have 0, 2, 3, 4, 5, or 6 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.