I don't think Hispanic.
Surname "Sano" from the Dictionary of American Family Names, 2nd edition, © Oxford University Press, 2022:
- Japanese: written 佐野 ‘small field’. This name is found throughout Japan. The first element in fact means ‘help’ and is used phonetically. Some bearers have samurai connections.
- Italian: nickname from sano ‘healthy’ (from Latin sanus).
- Italian: from a short form of any of several adjectival habitational names formed with the ending -sano, as for example Formisano or Palmisano. Compare Di Sano.
Some characteristic forenames: Japanese Hiroshi, Kazuhiko, Masaaki, Tomomi, Yumiko, Akira, Chiharu, Katsuhiko, Masashi, Takuya, Toru, Yuichi. Italian Salvatore, Angelo, Pietro, Nunzio.