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Castor was ranked #4,192 among boy names in 2018, and #6,043 in 2017.
Castor was first given as a name in the U.S. in the 1990s.
The popularity of Castor reached its heights in the 2010s. Its second most popular decade was the 2000s.
Since 1880, approximately 259 people in the U.S. have been given this name.