In the world, Sadashi (Sadashi 
) is a common male forename. The first name Sadashi is habitual in Japan, where it is quite a common masculine name, and India, where it is a very rare unisex name.
Abe, Sasaki, Suzuki, Tanaka, Takagi, Takeda, Nozawa, Fukuda, Oikawa, Yamada, Matsuda, Shinogi, Kumagai, Fujisawa, Yoshida, Murakami, Sakamoto, Sugawara, Sugimoto, Takekawa, Takeuchi, Nakamura, Sarkar, Mondal, Matsuo, Manjhi, Ram, Ida, Ito, Oda, Mori, Sato, Kato, Kudo, Goto, Ooba, Yamazaki, Yano, Saito, Arita, Chiba, Naito, Inoue, Okada, Ogawa, Yadav, Ujiie, Mandal, Miura, and Takahashi