Mars ranks #860 with 137 male registrations. The name is the Roman god of war and the fourth planet from the sun, and on a pet license it functions as one of the cleanest mythology-celestial dual-register pet picks available: a single hard syllable carrying multiple cultural anchors.
The dual-source name
Mars sits with Venus, Jupiter, and Atlas in the cluster of mythology-celestial pet names whose dual register gives them broader cultural elasticity than purely mythological choices. The Roman war god lends gravity and warrior-coding; the planet lends a celestial-cool register that pairs well with sibling-pet pairings (a Mars and a Luna, for example). Bruno Mars (the singer) provides a lighter pop-culture layer for some younger owners.
Sound and breed lean
One syllable, hard M opening into an open A and a sibilant tail. The name calls cleanly outdoors and the sharp final consonants help recall in chaotic settings. Mars lands with notable concentration on red or rust-coated dogs (Vizslas, Irish setters, Rhodesian Ridgebacks) where the planet's red-color association matches the coat literally, and on muscular working breeds whose temperament owners read as warrior-coded. See Vizsla names for the color-match cluster.
The counter-reading
The honest read is that Mars is a celebrated pet-name choice precisely because it sounds nothing like a typical human name. The human Mars page shows minimal SSA presence; this is comfortably pet territory. If the household wants the mythological-warrior register with more elaboration, Maximus or Atlas sit close.