The odd name is a back-formation from the first trans-Neptunian object found, 1992QB1 (nicknamed "Smiley"). Later objects were called "QB1-o's", or cubewanos.
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... out of which 19.6% have children under the age of 18 living with them, 54.9% are married couples living together, 5.6% have a female householder with no husband ...