Hiro ranks #846 with 139 male registrations. The name is a Japanese masculine (commonly meaning "abundant" or "generous" depending on the kanji) and on a pet license usually marks one of three distinct owner profiles.
The triple-source name
Hiro lands on US pet licenses through three primary cultural channels. Japanese-American households use it as straightforward heritage (the name is common in Japan with multiple kanji meanings). Anime-fan households associate it with characters across Naruto, Big Hero 6 (Hiro Hamada), and other titles. Heroes-the-NBC-show fans associate it with Hiro Nakamura, the time-bending office worker. The English-language pun (Hiro / hero) adds a fourth layer of appeal that almost every owner recognizes.
Sound and breed lean
Two syllables, front-stressed (HEE-roh), with a soft H opening and an open -o close. The name calls clearly outdoors and works particularly well in noisy environments because of the long open vowels. Hiro lands with notable concentration on Asian-coded breeds (Shiba Inu, Akita, Japanese spitz) where the heritage match is part of the appeal. See Shiba Inu names for the cluster.
The counter-reading
The honest read is that Hiro is a deliberate cultural choice on either heritage or fandom grounds, and households outside both camps may not register the depth of the reference. The human Hiro page shows climbing SSA presence as the name enters wider American use. Kenji sits nearby with similar Japanese heritage register.