Maxx is a punchy double-x spelling of Max, the short form of Maximilian and Maxwell; the Latin root maximus means "greatest". The extra letter gives the name a brand-like, high-energy look that appealed to parents in the 2000s. Maxx entered the US top 1000 in 2009, peaked at number 954 in 2010 and has since settled at number 1761 among boys' names in 2025.