A quadrilateral with at least one pair of parallel sides has multiple possible names, depending on what type of quadrilateral it is.
Square
Rectangle
Parallelogram
Rhomboid
Trapezoid
You are probably looking for only one pair of parallel sides, which is a trapezoid - both regular and irregular.
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rectagle ONE pair of parallel sides would be a trapezium or a trapezoid.
Trapezoids have only one pair of parallel sides.
A trapezium.
Every quadrilateral that is a standard square, rectangle, or parallelogram has at least ONE pair of parallel sides - and they all have two pairs of parallel sides. For only ONE pair of parallel sides, you need an irregular trapezoid.
A trapezium (most of the world) or a trapezoid (US).