Worldwide, Hirotaro (Hirotaro ) is an extremely rare boy's forename. Much less frequently, Hirotaro is the last name as well as the forename.
Ito, Matsumoto, Yamamoto, Yamakawa, Watanabe, Nakamura, Kitamura, Hayashi, Yamane, Ochiai, Nonaka, Nakano, Tanaka, Kariya, Suzuki, Kato, Sono, Mori, Nishikawa, and Nishiyama
) is an extremely rare boy's forename. Much less frequently, Hirotaro is the last name as well as the forename.