Genaro is the Spanish form of the Italian Gennaro, from the Latin Januarius, which means "of January" or "dedicated to Janus", the Roman god of beginnings. Saint Januarius, San Gennaro, is the patron of Naples, and his feast is celebrated every September with a famous street festival in New York's Little Italy. In the United States Genaro sat in the top 1000 at number 981 in 2000 and has since slipped to number 2268 in 2025.