Luigi ranks at #605 with 203 entries, registered male. The name is the Italian form of Louis — Germanic-rooted, traditionally translated as "famous warrior" — and it has been quietly riding two parallel cultural waves on the pet side: the older Italian-American naming tradition and the newer Nintendo-Mario-Bros gaming overlay.
The Mario lineage
For owners under 45, the dominant cultural anchor is Luigi the green-clad younger brother of Mario, present in Nintendo games since Mario Bros (1983) and continuously visible across forty-plus years of game releases, animated series, and the 2023 Super Mario Bros. Movie. The Mario-and-Luigi naming pattern shows up on bonded pet pairs: a brother dog named Mario and his sibling Luigi, or two cats from the same litter.
The Italian-American lineage
The older lineage runs through Italian-American naming patterns, where Luigi is a generational name worn by grandfathers and great-uncles. Owners reaching for Luigi through this door tend to be older, Italian-heritage-aware, and treat the name as homage rather than pop-culture reference. Both readings produce the same warm three-syllable name.
Breed lean and sound
Three syllables (loo-EE-jee), second-stressed, with a soft opening and a buzzing mid-consonant. The name lands disproportionately on green-coded pets (rare in mammals, common as a costume choice), Italian breeds (Cane Corsos, Italian Greyhounds, Maltese), and stocky friendly mixes. The Luigi baby name page shows minimal SSA presence; pet Luigi owns the cultural space.