They're called Ravenclaw's. They don't have any other nicknames.
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There is no Rowena Ravenclaw in the Harry Potter movies, only her daughter, Helena Ravenclaw.
the blue house is called ravenclaw it is a house for smartness and a thirst for knowledge i would love to be in there (:
She lives in a lavatory now; she used to be a Ravenclaw.
"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.
You obviously haven't read the Harry Potter series! (which I highly recommend you doing!!!) In Hogwarts School of Witchcraft and Wizardry, the students are placed into four different houses: Gryffindor, Slytherin, Hufflepuff and Ravenclaw.