A distinctive pick — fewer than 1 pets share this name.
An Irish surname meaning 'descendant of Niall,' an alternative spelling of Oneil.
Oneill carries the same proud Irish heritage as Oneil with double-letter charm. The two syllables feel sturdy and historic. It suits a noble male pet with quiet strength. Oneill appeals to owners who love traditional Irish surnames with character.
Pets named Oneill are most often described as:
Trait order based on owner reports across pet registries.
Oneill is a well-known pet name with 1 registered pets. Pets named Oneill are often described as noble, strong, loyal.
Oneill is more commonly given to male pets, though it can be used for any pet.
Last updated May 2026 · Data: NYC & Seattle pet licensing records · Methodology