Onyx ranks at #201 with 529 entries, and the name belongs to the small but recognizable category of mineral-coded pet names that have grown over the past decade. Onyx is specifically a black-coat name — the gemstone reference is doing literal descriptive work most of the time.
The mineral-and-stone cluster
Onyx sits with Jasper, Ruby, and Jade in the mineral-name pet cluster. These names have been climbing on baby and pet charts in parallel since the mid-2010s, part of a broader trend toward nature-and-substance names. Onyx is the most male-coded of the cluster, and the visual register (deep black, polished) gives the name a clear breed and coat target.
One counter-reading: Onyx works for small cats and lizards as well as for dogs. A meaningful share of black cats — particularly Bombays and black domestic shorthairs — end up with the name. The same descriptor logic that lands the name on Cane Corsos and black Labradors also lands it on cats whose owners want something more substantial than "Midnight" or "Shadow."
Where the name lands by breed
Black Labradors, Cane Corsos, Rottweilers, Belgian Malinois, and black-coated mixed breeds over-index on Onyx. Compare with the Cane Corso leaderboard, where mineral and stone names cluster at higher rates than across the broader pet leaderboard. The one-syllable shape with the X consonant gives the name a sharp recall edge: short, punctuated, easy to call across distance. Owners cross-shopping similar names usually consider Jasper and Raven alongside Onyx, picking based on whether they want a male or neutral register and which name fits best alongside other pets already in the household.