No one really knows who the heir of Ravenclaw is but a possible candidate could be Marcus Belby he is a student in Ravenclaw he was considered for the Slug Club and his Uncle Damocles is known for inventing the Wolfsbane Potion. I imagine that the descendants of the founders would have inherited some of their powers, talent, and/or cleverness, as we know that Voldemort (and his mother, uncle and grandfather) had inherited some of Slytherin's.
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There is no Rowena Ravenclaw in the Harry Potter movies, only her daughter, Helena Ravenclaw.
Rowena Ravenclaw
There is only one distant heir for Helga Hufflepuff that is mentioned in the books. Hepzibah Smith is a descendant- just like Tom Riddle (Voldemort) is a descendant of Salazar Slytherin- but there is never any mention of Hufflepuff's children like with Rowena Ravenclaw (who is mother to Helena Ravenclaw, whose ghost is known as The Grey Lady).
"Wit beyond measure is a man's greatest treasure" -- Rowena Ravenclaw Ravenclaw's are smart in one way or another - For example, Cho was academically bright whereas Luna was insightful and philosophical.
Rowena Ravenclaw, Salazar Slytherin, Helga Hufflepuff, and Godric Gryffindor are the Hogwarts founders. Ravenclaw, Slytherin, Hufflepuff, and Gryffindor, the four houses, are all named after the founders.