A trapezium (US trapezoid).
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a Trapezoid
You call it a parallelogram.
Well, you are supposed to call an irregular quadrilateral an IRREGULAR QUADRILATERAL. Haha. There really isn't any name for a regular quadrilateral. You just call it a quadrilateral or whatever the shape is. You could call it a REGULAR QUADRILATERAL.
There is no specific name. Irregular is not enough because a rectangle is irregular.
a square or rectangular are the first things that came to my mind