If the implication is that it is a quadrilateral with one a pair of equal sides and one pair of unequal sides, it could be an isosceles trapezium, or a non-isosceles trapezium one of whose sloped sides is equal to either the base or the top, or a distorted kite or arrowhead - neither of which have a specific name.
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rhombus
A trapezoid or trapezium. UK definition verses American. One has 2 sides parallel, one has no sides parallel. Take your pick.
A pentagon. If the sides and angles are equal it is a REGULAR pentagon.
Trapezoid
Eight sided shape is called octagon.